Patch merged into coreboot/master: vboot/vboot_common: actually provide a writable region_device

the following patch was just integrated into master:
commit a73a803bcd79730deac47f9f8e87a232c96432b0
Author: Aaron Durbin 
Date:   Tue Aug 23 13:19:14 2016 -0500

vboot/vboot_common: actually provide a writable region_device

vboot_named_region_device_rw() is supposed to provide a writable
    region_device. However, it was calling fmap_locate_area_as_rdev()
    which only provides a read-only one. Fix this.

BUG=chrome-os-partner:56151

Change-Id: I6279fde32132b1b6138292c3ef771c59709e00c6
    Signed-off-by: Aaron Durbin 
    Reviewed-on: https://review.coreboot.org/16302
    Tested-by: build bot (Jenkins)
    Reviewed-by: Furquan Shaikh 
    Reviewed-by: Paul Menzel

See https://review.coreboot.org/16302 for details.

-gerrit