[coreboot-gerrit] Patch merged into coreboot/master: drivers/lenovo: Add hybrid graphics driver

the following patch was just integrated into master:
commit 5919ba42ed0ce5b1b13717514698444232c6036c
Author: Patrick Rudolph 
Date:   Sat Dec 26 08:35:08 2015 +0100

drivers/lenovo: Add hybrid graphics driver

Add a universal hybrid graphics driver compatible with
    all supported lenovo devices.
    Hybrid graphics allows to connect the display panel to
    either of one GPUs.
    As there are only two GPUs one GPIO needs to be toggled.
    In case the discrete GPU is activated the panel is routed to it.
    On deactivation the panel is routed to the integrated
    GPU.
    On lenovo laptops the dGPU is always connected to PEG10 and it is
    save to disable the PEG slot on dGPU deactivation.

Use common gpio.c for southbridge I82801IX.

Tested on Lenovo T520 using Nvidia NVS 5200m.

Removed Lenovo T430s from the list of supported devices,
    as the T430s only supports "muxless Optimus".

Depends on change id:
    Iccc6d254bafb927b6470704cec7c9dd7528e2c68
    Ibb54c03fd83a529d1ceccfb2c33190e7d42224d8
    I8bd981c4696c174152cf41caefa6c083650d283a
    Iaf0c2f941f2625a5547f9cba79da1b173da6f295
    I994114734fa931926c34ed04305cddfbeb429b62

Change-Id: I9b80b31a7749bdf893ed3b772a6505c9f29a56d1
    Signed-off-by: Patrick Rudolph 
    Reviewed-on: https://review.coreboot.org/12896
    Tested-by: build bot (Jenkins)
    Reviewed-by: Martin Roth 
    Reviewed-by: Philipp Deppenwiese

See https://review.coreboot.org/12896 for details.

-gerrit