Add local vga.h for prototypes. Change-Id: I5ff627c6420d4b7fd1bc9a537f406ef6d9597522 Signed-off-by: Vikram Narayanan <vikram186@gmail.com> Signed-off-by: Stefan Reinauer <reinauer@google.com> Reviewed-on: http://review.coreboot.org/588 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>