edac: sb_edac: Let the driver depend on PCI_MMCONFIG

This driver needs to access PCIe Extended Configuration Space
Registers (0x100~0xfff), to correctly access those registers, we need
to enable PCI_MMCONFIG option. Since this option is not enabled for
X86_64 by default, we let the driver depend on it to prevent users
forgetting to enable this option.
Signed-off-by: NHui Wang <jason77.wang@gmail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

drivers/edac/Kconfig

@@ -214,8 +214,8 @@ config EDAC_I7300
 
 config EDAC_SBRIDGE
 	tristate "Intel Sandy-Bridge Integrated MC"
-	depends on EDAC_MM_EDAC && PCI && X86 && X86_MCE_INTEL
-	depends on EXPERIMENTAL
+	depends on EDAC_MM_EDAC && PCI && X86_64 && X86_MCE_INTEL
+	depends on PCI_MMCONFIG && EXPERIMENTAL
 	help
 	  Support for error detection and correction the Intel
 	  Sandy Bridge Integrated Memory Controller.