Patch merged into coreboot/master: soc/intel/skylake: add option to enable VR specific mailbox cmd

the following patch was just integrated into master:
commit af31a998c95f377e65798b8fdae1e303f67de45d
Author: Rizwan Qureshi 
Date:   Wed Feb 24 14:31:40 2016 +0530

soc/intel/skylake: add option to enable VR specific mailbox cmd

Adding an option to enable VR specific mailbox command.
    When set, an extra VR mailbox command specifically for
    the MPS IMPV8 VR will be sent.

BUG=chrome-os-partner:48511
    BRANCH=None
    TEST=Verified on glados, clean S0ix entry and exit.
            IMVP8 power is also pretty low

Change-Id: Ia5a23cbb1eca8b463eb7c7c279b74635f1d6b9f7
    Signed-off-by: Patrick Georgi 
    Original-Commit-Id: c90a799b51fe35bf184dca6ffce59c89a60f9917
    Original-Change-Id: Iffd3fbcb9a15611eefc942529e6cdafba859fb2e
    Original-Signed-off-by: Robbie Zhang 
    Original-Signed-off-by: Rizwan Qureshi 
    Original-Reviewed-on: https://chromium-review.googlesource.com/329393
    Original-Reviewed-by: Aaron Durbin 
    Reviewed-on: https://review.coreboot.org/13982
    Tested-by: build bot (Jenkins)
    Reviewed-by: Martin Roth

See https://review.coreboot.org/13982 for details.

-gerrit