Patch merged into coreboot/master: 2b59a83 vboot: add vbnv flash driver

the following patch was just integrated into master:
commit 2b59a838b4b6dd68994ae5883d4f1692c2217b16
Author: Daisuke Nojiri 
Date:   Wed Oct 29 11:18:11 2014 -0700

vboot: add vbnv flash driver

this adds a driver for vboot to read and write nvdata in spi flash.
    it's assumed that flash contents are erased to 1-bits and write
    operations can only change 1-bits to 0-bits.

when all nvram space is used, the driver will erase the whole block
    and start the next write from the beginning.

BUG=chrome-os-partner:32774
    BRANCH=ToT
    TEST=Built for cosmos.

Change-Id: I40858f847151aa0770e1101e905476d270550f60
    Signed-off-by: Stefan Reinauer 
    Original-Commit-Id: 09713828b7b0cabd13a08de3f34e32bc4dbef4a4
    Original-Change-Id: Ia9049f342b21fa4c289cb7b9254ab89ec1ef1699
    Original-Signed-off-by: Daisuke Nojiri 
    Original-Reviewed-on: https://chromium-review.googlesource.com/226525
    Original-Reviewed-by: Aaron Durbin 
    Reviewed-on: http://review.coreboot.org/9229
    Tested-by: build bot (Jenkins)
    Reviewed-by: David Hendricks 
    Reviewed-by: Paul Menzel

See http://review.coreboot.org/9229 for details.

-gerrit