Patch merged into coreboot/master: lib/cbfs_spi: provide boot_device_rw() support

the following patch was just integrated into master:
commit 504b8f2da211735e60b861106bf665a62091c36d
Author: Aaron Durbin 
Date:   Thu Aug 11 11:10:42 2016 -0500

lib/cbfs_spi: provide boot_device_rw() support

Provide the RW boot device operations for the common cbfs
    SPI wrapper. The RW region_device is the same as the read-only
    one. As noted in the boot_device_rw() introduction patch the
    mmap() support should not be used in conjuction with writing
    as that results in incoherent operations. That's fine as the
    current mmap() support is only used in the cbfs layer which
    does not support writing, i.e. no cbfs regions would be
    written to with any previous or outstanding mmap() calls.

BUG=chrome-os-partner:56151

Change-Id: I7cc7309a68ad23b30208ac961b1999a79626b307
    Signed-off-by: Aaron Durbin 
    Reviewed-on: https://review.coreboot.org/16199
    Tested-by: build bot (Jenkins)
    Reviewed-by: Furquan Shaikh

See https://review.coreboot.org/16199 for details.

-gerrit