sh: Fix up unmet dependency warnings with USB EHCI/OHCI selects.

Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

arch/sh/Kconfig

@@ -348,7 +348,7 @@ config CPU_SUBTYPE_SH7720
 	select SYS_SUPPORTS_CMT
 	select ARCH_WANT_OPTIONAL_GPIOLIB
 	select USB_ARCH_HAS_OHCI
-	select USB_OHCI_SH
+	select USB_OHCI_SH if USB_OHCI_HCD
 	help
 	  Select SH7720 if you have a SH3-DSP SH7720 CPU.
 
@@ -358,7 +358,7 @@ config CPU_SUBTYPE_SH7721
 	select CPU_HAS_DSP
 	select SYS_SUPPORTS_CMT
 	select USB_ARCH_HAS_OHCI
-	select USB_OHCI_SH
+	select USB_OHCI_SH if USB_OHCI_HCD
 	help
 	  Select SH7721 if you have a SH3-DSP SH7721 CPU.
 
@@ -442,7 +442,7 @@ config CPU_SUBTYPE_SH7763
 	bool "Support SH7763 processor"
 	select CPU_SH4A
 	select USB_ARCH_HAS_OHCI
-	select USB_OHCI_SH
+	select USB_OHCI_SH if USB_OHCI_HCD
 	help
 	  Select SH7763 if you have a SH4A SH7763(R5S77631) CPU.
 
@@ -470,9 +470,9 @@ config CPU_SUBTYPE_SH7786
 	select GENERIC_CLOCKEVENTS_BROADCAST if SMP
 	select ARCH_WANT_OPTIONAL_GPIOLIB
 	select USB_ARCH_HAS_OHCI
-	select USB_OHCI_SH
+	select USB_OHCI_SH if USB_OHCI_HCD
 	select USB_ARCH_HAS_EHCI
-	select USB_EHCI_SH
+	select USB_EHCI_SH if USB_EHCI_HCD
 
 config CPU_SUBTYPE_SHX3
 	bool "Support SH-X3 processor"