Patch merged into coreboot/master: drivers/regulator: Add driver for handling GPIO-based fixed regulator

the following patch was just integrated into master:
commit 60f3217ed9a91bcf96a49af83fac3dcbaf54aa88
Author: Furquan Shaikh 
Date:   Mon Dec 12 09:30:42 2016 -0800

drivers/regulator: Add driver for handling GPIO-based fixed regulator

This change adds the required device node in SSDT for defining
    GPIO-based fixed voltage regulator.

BUG=chrome-os-partner:60194
    BRANCH=None
    TEST=Verified that ELAN touchscreen works with exported GPIOs and ACPI
    regulator.

Change-Id: I4380aea0929fb7e81dbe83f940e3e51e983819f9
    Signed-off-by: Furquan Shaikh 
    Reviewed-on: https://review.coreboot.org/17798
    Tested-by: build bot (Jenkins)
    Reviewed-by: Duncan Laurie

See https://review.coreboot.org/17798 for details.

-gerrit