Staging: comedi: fix build breakages on some platforms

Some platforms do not have virt_to_bus(), so properly depend on
CONFIG_VIRT_TO_BUS for the Comedi drivers that need this function.
Reported-by: NStephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/staging/comedi/Kconfig

@@ -161,6 +161,7 @@ config COMEDI_PCL730
 
 config COMEDI_PCL812
 	tristate "Advantech PCL-812/813 and ADlink ACL-8112/8113/8113/8216"
+	depends on VIRT_TO_BUS
 	default N
 	---help---
 	  Enable support for Advantech PCL-812/PG, PCL-813/B, ADLink
@@ -172,6 +173,7 @@ config COMEDI_PCL812
 
 config COMEDI_PCL816
 	tristate "Advantech PCL-814 and PCL-816 ISA card support"
+	depends on VIRT_TO_BUS
 	default N
 	---help---
 	  Enable support for Advantech PCL-814 and PCL-816 ISA cards
@@ -181,6 +183,7 @@ config COMEDI_PCL816
 
 config COMEDI_PCL818
 	tristate "Advantech PCL-718 and PCL-818 ISA card support"
+	depends on VIRT_TO_BUS
 	default N
 	---help---
 	  Enable support for Advantech PCL-818 ISA cards
@@ -270,6 +273,7 @@ config COMEDI_DAS800
 
 config COMEDI_DAS1800
 	tristate "DAS1800 and compatible ISA card support"
+	depends on VIRT_TO_BUS
 	select COMEDI_FC
 	default N
 	---help---
@@ -341,6 +345,7 @@ config COMEDI_DT2817
 config COMEDI_DT282X
 	tristate "Data Translation DT2821 series and DT-EZ ISA card support"
 	select COMEDI_FC
+	depends on VIRT_TO_BUS
 	default N
 	---help---
 	  Enable support for Data Translation DT2821 series including DT-EZ
@@ -420,6 +425,7 @@ config COMEDI_ADQ12B
 config COMEDI_NI_AT_A2150
 	tristate "NI AT-A2150 ISA card support"
 	depends on COMEDI_NI_COMMON
+	depends on VIRT_TO_BUS
 	default N
 	---help---
 	  Enable support for National Instruments AT-A2150 cards
@@ -537,6 +543,7 @@ if COMEDI_PCI_DRIVERS && PCI
 
 config COMEDI_ADDI_APCI_035
 	tristate "ADDI-DATA APCI_035 support"
+	depends on VIRT_TO_BUS
 	default N
 	---help---
 	  Enable support for ADDI-DATA APCI_035 cards
@@ -546,6 +553,7 @@ config COMEDI_ADDI_APCI_035
 
 config COMEDI_ADDI_APCI_1032
 	tristate "ADDI-DATA APCI_1032 support"
+	depends on VIRT_TO_BUS
 	default N
 	---help---
 	  Enable support for ADDI-DATA APCI_1032 cards
@@ -555,6 +563,7 @@ config COMEDI_ADDI_APCI_1032
 
 config COMEDI_ADDI_APCI_1500
 	tristate "ADDI-DATA APCI_1500 support"
+	depends on VIRT_TO_BUS
 	default N
 	---help---
 	  Enable support for ADDI-DATA APCI_1500 cards
@@ -564,6 +573,7 @@ config COMEDI_ADDI_APCI_1500
 
 config COMEDI_ADDI_APCI_1516
 	tristate "ADDI-DATA APCI_1516 support"
+	depends on VIRT_TO_BUS
 	default N
 	---help---
 	  Enable support for ADDI-DATA APCI_1516 cards
@@ -573,6 +583,7 @@ config COMEDI_ADDI_APCI_1516
 
 config COMEDI_ADDI_APCI_1564
 	tristate "ADDI-DATA APCI_1564 support"
+	depends on VIRT_TO_BUS
 	default N
 	---help---
 	  Enable support for ADDI-DATA APCI_1564 cards
@@ -582,6 +593,7 @@ config COMEDI_ADDI_APCI_1564
 
 config COMEDI_ADDI_APCI_16XX
 	tristate "ADDI-DATA APCI_16xx support"
+	depends on VIRT_TO_BUS
 	default N
 	---help---
 	  Enable support for ADDI-DATA APCI_16xx cards
@@ -591,6 +603,7 @@ config COMEDI_ADDI_APCI_16XX
 
 config COMEDI_ADDI_APCI_2016
 	tristate "ADDI-DATA APCI_2016 support"
+	depends on VIRT_TO_BUS
 	default N
 	---help---
 	  Enable support for ADDI-DATA APCI_2016 cards
@@ -600,6 +613,7 @@ config COMEDI_ADDI_APCI_2016
 
 config COMEDI_ADDI_APCI_2032
 	tristate "ADDI-DATA APCI_2032 support"
+	depends on VIRT_TO_BUS
 	default N
 	---help---
 	  Enable support for ADDI-DATA APCI_2032 cards
@@ -609,6 +623,7 @@ config COMEDI_ADDI_APCI_2032
 
 config COMEDI_ADDI_APCI_2200
 	tristate "ADDI-DATA APCI_2200 support"
+	depends on VIRT_TO_BUS
 	default N
 	---help---
 	  Enable support for ADDI-DATA APCI_2200 cards
@@ -618,6 +633,7 @@ config COMEDI_ADDI_APCI_2200
 
 config COMEDI_ADDI_APCI_3001
 	tristate "ADDI-DATA APCI_3001 support"
+	depends on VIRT_TO_BUS
 	select COMEDI_FC
 	default N
 	---help---
@@ -628,6 +644,7 @@ config COMEDI_ADDI_APCI_3001
 
 config COMEDI_ADDI_APCI_3120
 	tristate "ADDI-DATA APCI_3520 support"
+	depends on VIRT_TO_BUS
 	select COMEDI_FC
 	default N
 	---help---
@@ -638,6 +655,7 @@ config COMEDI_ADDI_APCI_3120
 
 config COMEDI_ADDI_APCI_3501
 	tristate "ADDI-DATA APCI_3501 support"
+	depends on VIRT_TO_BUS
 	default N
 	---help---
 	  Enable support for ADDI-DATA APCI_3501 cards
@@ -647,6 +665,7 @@ config COMEDI_ADDI_APCI_3501
 
 config COMEDI_ADDI_APCI_3XXX
 	tristate "ADDI-DATA APCI_3xxx support"
+	depends on VIRT_TO_BUS
 	default N
 	---help---
 	  Enable support for ADDI-DATA APCI_3xxx cards
@@ -713,6 +732,7 @@ config COMEDI_ADL_PCI9111
 config COMEDI_ADL_PCI9118
 	tristate "ADLink PCI-9118DG, PCI-9118HG, PCI-9118HR support"
 	select COMEDI_FC
+	depends on VIRT_TO_BUS
 	default N
 	---help---
 	  Enable support for ADlink PCI-9118DG, PCI-9118HG, PCI-9118HR cards
@@ -1288,6 +1308,7 @@ config COMEDI_NI_LABPC
 	depends on COMEDI_MITE
 	select COMEDI_8255
 	select COMEDI_FC
+	depends on VIRT_TO_BUS
 	default N
 	---help---
 	  Enable support for National Instruments Lab-PC and compatibles