Patch merged into coreboot/master: drivers/spi: provide a mechanism to obtain the SPI flash boot device

the following patch was just integrated into master:
commit 305c0cafaa2fe7d766918898692971b70259b4ac
Author: Aaron Durbin 
Date:   Sat Dec 3 17:04:06 2016 -0600

drivers/spi: provide a mechanism to obtain the SPI flash boot device

The MRC cache wants to be able to access the SPI flash boot device.
    Allow an easy way to provide that so that there isn't duplicate
    spi_flash objects representing the same device.

BUG=chrome-os-partner:56151

Change-Id: Iba92e8bb8a6060cdd327b10f5f8ec23ac61101e7
    Signed-off-by: Aaron Durbin 
    Reviewed-on: https://review.coreboot.org/17715
    Tested-by: build bot (Jenkins)
    Reviewed-by: Furquan Shaikh

See https://review.coreboot.org/17715 for details.

-gerrit