Patch merged into coreboot/master: rockchip: rk3399: Add support i2s

the following patch was just integrated into master:
commit 96fbc31027b8e208c264d96c04f45799cea3417e
Author: Xing Zheng 
Date:   Thu May 19 11:39:20 2016 +0800

rockchip: rk3399: Add support i2s

This patch enable and configure the clocks and IOMUX for i2s audio path,
    and the i2s0 clock is from CPLL.

Please refer to TRM V0.3 Part 1 Chapter 3 CRU, P126/P128/P144/P154/P155
    for the i2s clock div and gate setting.

BRANCH=none
    BUG=chrome-os-partner:52172
    TEST=boot kevin rev1, press ctrl+u and hear the beep voice.

Change-Id: Id00baac965c8b9213270ba5516e1ca684e4304a6
    Signed-off-by: Martin Roth 
    Original-Commit-Id: 9c58fa7
    Original-Change-Id: I130a874a0400712317e5e7a8b3b10a6f04586f68
    Original-Signed-off-by: Xing Zheng 
    Original-Reviewed-on: https://chromium-review.googlesource.com/347526
    Original-Commit-Ready: Wonjoon Lee 
    Original-Reviewed-by: Vadim Bendebury 
    Reviewed-on: https://review.coreboot.org/15034
    Tested-by: build bot (Jenkins)
    Reviewed-by: Furquan Shaikh

See https://review.coreboot.org/15034 for details.

-gerrit