x86: prepare consolidation of cpu/ related code usage

Move mce.c to mce_32.c to allow the later move of the x86_64 mce.c
from arch/x86/kernel/ to ...kernel/cpu/mcheck

No code change.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

arch/x86/kernel/cpu/mcheck/Makefile

-obj-$(CONFIG_X86_32)		=  mce.o k7.o p4.o p5.o p6.o winchip.o
+obj-y				=  mce_$(BITS).o therm_throt.o
+obj-$(CONFIG_X86_32)		+= k7.o p4.o p5.o p6.o winchip.o
 obj-$(CONFIG_X86_MCE_NONFATAL)	+= non-fatal.o
-
-# shared between i386 and x86_64
-obj-y 				+= therm_throt.o