Patch merged into coreboot/master: c38d3e8 arm64: implement CPU power down sequence as per A57/A53/A72 TRM

the following patch was just integrated into master:
commit c38d3e8131b0f6ed7e576d1a66ac9513b1810f27
Author: Joseph Lo 
Date:   Wed Apr 15 10:09:50 2015 +0800

arm64: implement CPU power down sequence as per A57/A53/A72 TRM

Implement the individual core powerdown sequence as per
    Cortex-A57/A53/A72 TRM.

Based-on-the-work-by:
    Varun Wadekar

BRANCH=none
    BUG=none
    TEST=boot on smaug/foster, verify the cpu_on/off is ok as well

Change-Id: I4719fcbe86b35f9b448d274e1732da5fc75346b0
    Signed-off-by: Patrick Georgi 
    Original-Commit-Id: b6bdcc12150820dfad28cef3af3d8220847c5d74
    Original-Change-Id: I65abab8cda55cfe7a0c424f3175677ed5e3c2a1c
    Original-Signed-off-by: Joseph Lo 
    Original-Reviewed-on: https://chromium-review.googlesource.com/265827
    Original-Reviewed-by: Aaron Durbin 
    Reviewed-on: http://review.coreboot.org/9980
    Tested-by: build bot (Jenkins)
    Reviewed-by: Marc Jones

See http://review.coreboot.org/9980 for details.

-gerrit