drivers/aspeed: Add native text mode VGA support for the AST2050

Change-Id: I37763a59d2546cd0c0e57b31fdb7aa77c2c50bee
Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com>
Reviewed-on: http://review.coreboot.org/11937
Reviewed-by: Peter Stuge <peter@stuge.se>
Tested-by: build bot (Jenkins)
15 files changed