x86: Move efi to platform

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Huang Ying <ying.huang@intel.com>

arch/x86/kernel/Makefile

@@ -81,7 +81,6 @@ obj-$(CONFIG_KEXEC)		+= relocate_kernel_$(BITS).o crash.o
 obj-$(CONFIG_CRASH_DUMP)	+= crash_dump_$(BITS).o
 obj-$(CONFIG_KPROBES)		+= kprobes.o
 obj-$(CONFIG_MODULES)		+= module.o
-obj-$(CONFIG_EFI) 		+= efi.o efi_$(BITS).o efi_stub_$(BITS).o
 obj-$(CONFIG_DOUBLEFAULT) 	+= doublefault_32.o
 obj-$(CONFIG_KGDB)		+= kgdb.o
 obj-$(CONFIG_VM86)		+= vm86_32.o

arch/x86/platform/Makefile

 # Platform specific code goes here
+obj-y	+= efi/
 obj-y	+= sfi/

arch/x86/platform/efi/Makefile

+obj-$(CONFIG_EFI) 		+= efi.o efi_$(BITS).o efi_stub_$(BITS).o