x86/PCI: build amd_bus.o only when CONFIG_AMD_NB=y

We only need amd_bus.o for AMD systems with PCI. arch/x86/pci/Makefile
already depends on CONFIG_PCI=y, so this patch just adds the dependency
on CONFIG_AMD_NB.

Cc: Yinghai Lu <[e-mail]>
Cc: [e-mail] # 2.6.34+ (needs adjustment for k8 -> amd rename)
Signed-off-by: Bjorn Helgaas <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

arch/x86/pci/Makefile

···
 obj-$(CONFIG_X86_INTEL_MID)	+= mrst.o
 
 obj-y				+= common.o early.o
-obj-y				+= amd_bus.o bus_numa.o
+obj-y				+= bus_numa.o
 
+obj-$(CONFIG_AMD_NB)		+= amd_bus.o
 obj-$(CONFIG_PCI_CNB20LE_QUIRK)	+= broadcom_bus.o
 
 ifeq ($(CONFIG_PCI_DEBUG),y)