Patch merged into coreboot/master: 3faa2c7 google/snow: enable GPIO entries and CHROMEOS in building

the following patch was just integrated into master:
commit 3faa2c77ed9103839002d1092424676790f07017
Author: Ronald G. Minnich 
Date:   Wed Feb 20 15:46:46 2013 -0800

google/snow: enable GPIO entries and CHROMEOS in building

These were not separable or it would have been two CLs.

Enable CHROMEOS configure option on snow. Write gpio support code for
    the mainboard.  Right now the GPIO just returns hard-wired values for
    "virtual" GPIOs.

Add a chromeos.c file for snow, needed to build.

This is tested and creates gpio table entries that our hardware can use.

Lots still missing but we can now start to fill in the blanks, since
    we have enabled CHROMEOS for this board. We are getting further into
    the process of actually booting a real kernel.

Change-Id: I5fdc68b0b76f9b2172271e991e11bef16f5adb27
    Signed-off-by: Ronald G. Minnich 
    Reviewed-on: http://review.coreboot.org/2467
    Tested-by: build bot (Jenkins)
    Reviewed-by: Stefan Reinauer

Build-Tested: build bot (Jenkins) at Sat Feb 23 04:51:30 2013, giving +1
Reviewed-By: Stefan Reinauer  at Mon Feb 25 18:49:59 2013, giving +2
See http://review.coreboot.org/2467 for details.

-gerrit