Patch merged into coreboot/master: lenovo: add config ONBOARD_VGA_IS_PRIMARY

the following patch was just integrated into master:
commit 8ebb95d0c8e9088c9961cf3f8a3fdfed17f0247e
Author: Patrick Rudolph 
Date:   Thu Mar 10 20:50:42 2016 +0100

lenovo: add config ONBOARD_VGA_IS_PRIMARY

Fix for the T4xx and T5xx series.
    It does not apply to X2xx/X6x series as those have only
    one GPU, which is always connected to the display.

The T6x series needs special care not handled with this patch.

Without ONBOARD_VGA_IS_PRIMARY the onboard GPU would be
    deactivated in case a dedicated GPU is found and active,
    leaving the system without a working display.

Change-Id: I94d1700e9afb75de83a4f2ed1ff53ba3b0559ae1
    Signed-off-by: Patrick Rudolph 
    Reviewed-on: https://review.coreboot.org/14031
    Tested-by: build bot (Jenkins)
    Reviewed-by: Alexander Couzens 
    Reviewed-by: Nicolas Reinecke

See https://review.coreboot.org/14031 for details.

-gerrit