build/roms: re-add SeaGRUB build support

it didn't work in the past, but it does work nowadays;
specifically, it only worked with libgfxinit in the past,
but not on VGA ROMs.

now it does work on VGA ROMs, tested on e6400 and t1650 so
it was enabled there.

in this setup, a special image is provided where SeaBIOS is
the main payload, but it only loads GRUB; nothing else, every.

this is called SeaGRUB. this setup is useful in cases where
the user only has a GPU that lacks libgfxinit support.

Signed-off-by: Leah Rowe <leah@libreboot.org>

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