Add a HAVE_ARCH_MEMMOVE option to allow overriding memmove.

Change-Id: I4b6a57e7d8e7e685c609b1d85368585b9dd197dc
Signed-off-by: Gabe Black <gabeblack@chromium.org>
Reviewed-on: http://review.coreboot.org/3761
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

src/Kconfig

@@ -244,6 +244,10 @@ config HAVE_ARCH_MEMCPY
 	bool
 	default n
 
+config HAVE_ARCH_MEMMOVE
+	bool
+	default n
+
 menu "Chipset"
 
 comment "CPU"