x86, apic: separate 32-bit setup functionality out of apic_32.c

Impact: build fix, cleanup

A couple of arch setup callbacks were mistakenly in apic_32.c, breaking
the build.

Also simplify the code a bit.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/arch/x86/kernel/apic/Makefile b/arch/x86/kernel/apic/Makefile
index 97f558d..da7b7b9 100644
--- a/arch/x86/kernel/apic/Makefile
+++ b/arch/x86/kernel/apic/Makefile
@@ -2,10 +2,9 @@
 # Makefile for local APIC drivers and for the IO-APIC code
 #
 
-obj-y				:= apic.o probe_$(BITS).o ipi.o nmi.o
+obj-$(CONFIG_X86_LOCAL_APIC)	+= apic.o probe_$(BITS).o ipi.o nmi.o
 obj-$(CONFIG_X86_IO_APIC)	+= io_apic.o
 obj-$(CONFIG_SMP)		+= ipi.o
-obj-$
 
 ifeq ($(CONFIG_X86_64),y)
 obj-y				+= apic_flat_64.o