[POWERPC] Always build setup-bus.c on powerpc

The common arch/powerpc code calls in to functions in setup-bus.c
so some builds of ppc32 would fail.

Note, ppc32 usage of setup-irq.c is limited to arch/ppc and should be
removed when arch/ppc goes away.
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/pci/Makefile

@@ -32,7 +32,7 @@ obj-$(CONFIG_ARM) += setup-bus.o setup-irq.o
 obj-$(CONFIG_PARISC) += setup-bus.o
 obj-$(CONFIG_SUPERH) += setup-bus.o setup-irq.o
 obj-$(CONFIG_PPC32) += setup-irq.o
-obj-$(CONFIG_PPC64) += setup-bus.o
+obj-$(CONFIG_PPC) += setup-bus.o
 obj-$(CONFIG_MIPS) += setup-bus.o setup-irq.o
 obj-$(CONFIG_X86_VISWS) += setup-irq.o