x86: Move sfi to platform

Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Cc: Len Brown <lenb@kernel.org>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>

arch/x86/kernel/Makefile

@@ -58,7 +58,6 @@ obj-$(CONFIG_INTEL_TXT)		+= tboot.o
 obj-$(CONFIG_STACKTRACE)	+= stacktrace.o
 obj-y				+= cpu/
 obj-y				+= acpi/
-obj-$(CONFIG_SFI)		+= sfi.o
 obj-y				+= reboot.o
 obj-$(CONFIG_MCA)		+= mca_32.o
 obj-$(CONFIG_X86_MSR)		+= msr.o

arch/x86/platform/Makefile

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

arch/x86/platform/sfi/Makefile

+obj-$(CONFIG_SFI)		+= sfi.o