[coreboot-gerrit] Patch merged into coreboot/master: chromeos: Add option to back up VBNV CMOS into flash

the following patch was just integrated into master:
commit fe970134543389634e9e6c78bc91a005b1548628
Author: Duncan Laurie 
Date:   Tue Jan 26 16:30:36 2016 -0800

chromeos: Add option to back up VBNV CMOS into flash

This adds a new kconfig option that will back up the VBNV data
    from CMOS to flash, and restore it if the CMOS data is invalid
    during boot.

This allows special flags to not get lost when power is lost,
    RTC reset is triggered, or CMOS is corrupted.

BUG=chrome-os-partner:47915
    BRANCH=glados
    TEST=manually tested on chell:
    1-boot and run "enable_dev_usb_boot"
    2-reboot and check that it is enabled with crossystem
    3-run "mosys nvram clear"
    4-reboot and check that it is still enabled

Change-Id: I38103d100117da34471734a6dd31eb7058735c12
    Signed-off-by: Patrick Georgi 
    Original-Commit-Id: 8a356e616c6885d5ae3b776691929675d48a28f9
    Original-Change-Id: I06e7ddff7b272e579c704914a0cf8cc14d6994e8
    Original-Signed-off-by: Duncan Laurie 
    Original-Reviewed-on: https://chromium-review.googlesource.com/324122
    Original-Reviewed-by: Aaron Durbin 
    Reviewed-on: https://review.coreboot.org/13600
    Tested-by: build bot (Jenkins)
    Reviewed-by: Martin Roth

See https://review.coreboot.org/13600 for details.

-gerrit