Patch merged into coreboot/master: drivers/i2c/generic: Allow mainboards to export reset and enable GPIOs

the following patch was just integrated into master:
commit 98915bb7a9ab696b3facf9a2fff3525ebb87531f
Author: Furquan Shaikh 
Date:   Mon Dec 12 09:23:01 2016 -0800

drivers/i2c/generic: Allow mainboards to export reset and enable GPIOs

Add power management type config option that allows mainboards to
    either:
    1. Define a power resource that uses the reset and enable gpios to
    power on and off the device using _ON and _OFF methods, or
    2. Export reset and enable GPIOs in _CRS and _DSD so that the OS can
    directly toggle the GPIOs as required.

GPIO type needs to be updated in drivers_i2c_generic_config to use
    acpi_gpio type so that it can be used for both the above cases.

BUG=chrome-os-partner:60194
    BRANCH=None
    TEST=Verified that elan touchscreen works fine on reef using exported
    GPIOs.

Change-Id: I4d76f193f615cfc4520869dedc55505c109042f6
    Signed-off-by: Furquan Shaikh 
    Reviewed-on: https://review.coreboot.org/17797
    Tested-by: build bot (Jenkins)
    Reviewed-by: Duncan Laurie

See https://review.coreboot.org/17797 for details.

-gerrit