x86_64: prepare shared kernel/acpi/wakeup.S

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86_64/kernel/acpi/Makefile

 obj-y			:= boot.o
 boot-y			:= ../../../i386/kernel/acpi/boot.o
-obj-$(CONFIG_ACPI_SLEEP)	+= sleep.o wakeup.o
+obj-$(CONFIG_ACPI_SLEEP)	+= sleep.o wakeup_64.o
 
 ifneq ($(CONFIG_ACPI_PROCESSOR),)
 obj-y			+= processor.o