i945: Disable IGD if plugin VGA is preferred

It's shut down, but UMA memory is not reclaimed. A later extension
could optionally do the magic register dance that allows initialization
of IGD as secondary graphics device.

Change-Id: I2a92bb71755005b886a8e1825325c678a9991bf2
Signed-off-by: Patrick Georgi <patrick.georgi@secunet.com>
Reviewed-on: http://review.coreboot.org/1252
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
1 file changed