Patch merged into coreboot/master: soc/intel/apollolake: Disable Periodic Retraining per-SKU

the following patch was just integrated into master:
commit c42a9ac4abcf0710fa15e2e8cf3b1321bd9f3360
Author: Andrey Petrov 
Date:   Thu Aug 25 11:06:08 2016 -0700

soc/intel/apollolake: Disable Periodic Retraining per-SKU

Certain LPDDR4 models have some HW issues that can be worked around
    by turning off Periodic Retraining feature in the memory controller.
    Add option to disable PR per SKU.

BUG=chrome-os-partner:55466
    TEST=run RMT test, pass

Change-Id: Ie7aa79586665f6d3a7edd854a9eef07e6a1b2ab8
    Signed-off-by: Andrey Petrov 
    Reviewed-on: https://review.coreboot.org/16320
    Reviewed-by: Aaron Durbin 
    Tested-by: build bot (Jenkins)

See https://review.coreboot.org/16320 for details.

-gerrit