Patch merged into coreboot/master: SPI: Fix command-response behavior

the following patch was just integrated into master:
commit 85b2b27e3309fcd783b825682dd715bee089ad01
Author: Kyösti Mälkki 
Date:   Tue Jan 10 06:25:57 2017 +0200

SPI: Fix command-response behavior

Fix SPI flash ops regressions after commit:
       c2973d1 spi: Get rid of SPI_ATOMIC_SEQUENCING

When spi_flash_cmd() is called with argument response==NULL,
    only send out command without reading back the response.

Change-Id: I28a94f208b4a1983d45d69d46db41391e267891d
    Signed-off-by: Kyösti Mälkki 
    Reviewed-on: https://review.coreboot.org/18082
    Tested-by: build bot (Jenkins)
    Reviewed-by: Timothy Pearson 
    Tested-by: Raptor Engineering Automated Test Stand 
    Reviewed-by: Aaron Durbin 
    Reviewed-by: Ronald G. Minnich

See https://review.coreboot.org/18082 for details.

-gerrit