x86: Add and enable an arch verson of memmove.

This is from memcpy_32.c in the Linux kernel. There was no copyright header
in the original file either.

Change-Id: Ifd259cb8a87615dce79ed1e551cc4bacb0414b4f
Signed-off-by: Gabe Black <gabeblack@chromium.org>
Reviewed-on: http://review.coreboot.org/3762
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

src/arch/x86/lib/Makefile.inc

@@ -6,6 +6,7 @@ ramstage-y += exception.c
 ramstage-$(CONFIG_IOAPIC) += ioapic.c
 ramstage-y += memset.c
 ramstage-y += memcpy.c
+ramstage-y += memmove.c
 ramstage-y += ebda.c
 ramstage-y += rom_media.c
 ramstage-$(CONFIG_COOP_MULTITASKING) += thread.c
@@ -15,13 +16,16 @@ romstage-$(CONFIG_EARLY_CONSOLE) += romstage_console.c
 romstage-y += cbfs_and_run.c
 romstage-y += memset.c
 romstage-y += memcpy.c
+romstage-y += memmove.c
 romstage-y += rom_media.c
 
 smm-y += memset.c
 smm-y += memcpy.c
+smm-y += memmove.c
 smm-y += rom_media.c
 
 rmodules-y += memset.c
 rmodules-y += memcpy.c
+rmodules-y += memmove.c
 
 $(obj)/arch/x86/lib/console.ramstage.o :: $(obj)/build.h