[coreboot] [PATCH] drop all copies of vgabios.c

[Stefan Reinauer]

This patch cleans up the option rom code in coreboot significantly by
dropping all extra copies of vgabios.c and instead changing the code to
use oprom/x86.c with custom per-board int15 handlers.

Corey, I can't test this on cn400/cn700 ... Can you? The code should go
in as is, but it might require some extra fixing, as (like with
vgabios.c before) the int15 handlers are all copies of the age-old
epia-m code. (except vx800)

Stefan