Patch merged into coreboot/master: rockchip/rk3399: Move romstage.c to mainboard/gru

the following patch was just integrated into master:
commit 868cd7128262ca8442301c2910ed843ab3f193ff
Author: Shunqian Zheng 
Date:   Thu Aug 25 02:28:19 2016 +0800

rockchip/rk3399: Move romstage.c to mainboard/gru

The romstage.c is more board related than soc specific, like
    setting the pwm regulators, so moving it to mainboard/gru.

BRANCH=none
    BUG=chrome-os-partner:54819
    TEST=Bootup on kevin board

Change-Id: I83c6cde9f451480e47e2b4b549cedf65b345134c
    Signed-off-by: Martin Roth 
    Original-Commit-Id: 35feeb07131a6a9de4adde035236987391833474
    Original-Change-Id: If2bf245302eb4fb20bb089c1b3ffa03909722443
    Original-Signed-off-by: Shunqian Zheng 
    Original-Reviewed-on: https://chromium-review.googlesource.com/375398
    Original-Reviewed-by: Julius Werner 
    Reviewed-on: https://review.coreboot.org/16367
    Tested-by: build bot (Jenkins)
    Reviewed-by: Aaron Durbin

See https://review.coreboot.org/16367 for details.

-gerrit