CBMEM: Rename utility file

This file will have CBMEM init hooks API one day.

Change-Id: I0c31495d4217a5eb235b13e6d8e8c99a87a3b840
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/8031
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/lib/Makefile.inc

@@ -81,7 +81,9 @@ else
 ramstage-y += cbmem.c
 romstage-y += cbmem.c
 endif # CONFIG_DYNAMIC_CBMEM
-ramstage-y += cbmem_info.c
+
+romstage-y += cbmem_common.c
+ramstage-y += cbmem_common.c
 
 ramstage-y += hexdump.c
 romstage-y += hexdump.c