x86: Drop support for /proc files when !CONFIG_PROC_FS

arch/x86/kernel/cpu/proc.c only exists to support files in /proc; omit that
file when compiling without CONFIG_PROC_FS.

Saves 645 additional bytes on 32-bit x86 when !CONFIG_PROC_FS:

add/remove: 0/5 grow/shrink: 0/0 up/down: 0/-645 (-645)
function old new delta
c_stop 1 - -1
c_next 11 - -11
cpuinfo_op 16 - -16
c_start 24 - -24
show_cpuinfo 593 - -593

Signed-off-by: Josh Triplett <[e-mail]>

arch/x86/kernel/cpu/Makefile

···
 CFLAGS_common.o		:= $(nostackp)
 
 obj-y			:= intel_cacheinfo.o scattered.o topology.o
-obj-y			+= proc.o capflags.o powerflags.o common.o
+obj-y			+= capflags.o powerflags.o common.o
 obj-y			+= rdrand.o
 obj-y			+= match.o
+
+obj-$(CONFIG_PROC_FS)	+= proc.o
 
 obj-$(CONFIG_X86_32)	+= bugs.o
 obj-$(CONFIG_X86_64)	+= bugs_64.o