Patch merged into coreboot/master: rockchip/rk3399: lower kevin board sdram frequency to 800MHz

the following patch was just integrated into master:
commit 8e09de297fce1de0693d2833d7a15f76fa2ce18a
Author: Lin Huang 
Date:   Thu Sep 8 11:16:26 2016 -0700

rockchip/rk3399: lower kevin board sdram frequency to 800MHz

We found some boards are not stable when sdram is run at 933Mhz.
    Before we can fix it, we need to lower the sdram frequency to 800MHz.
    In this patch we modify the DQS delay from 0x280 to 0x260 and extend
    the DQS window.

BRANCH=None
    BUG=chrome-os-partner:56940
    TEST=Booted Kevin.

Change-Id: I68561c4aa4d9ab66acfa3515a42d696157aff759
    Signed-off-by: Patrick Georgi 
    Original-Commit-Id: 877a7f6ad22a5bde9f9e458bcb65f133f2f001bd
    Original-Change-Id: I5eab6bbe96f0dae095c5353403292022e7a25421
    Original-Signed-off-by: Lin Huang 
    Original-Reviewed-on: https://chromium-review.googlesource.com/382724
    Original-Commit-Ready: Douglas Anderson 
    Original-Tested-by: Douglas Anderson 
    Original-Reviewed-by: Douglas Anderson 
    Reviewed-on: https://review.coreboot.org/16709
    Tested-by: build bot (Jenkins)
    Reviewed-by: Martin Roth

See https://review.coreboot.org/16709 for details.

-gerrit