Patch merged into coreboot/master: arm64: Set LOG_LEVEL=0 for BL31 if coreboot does not use serial

the following patch was just integrated into master:
commit 87d492fbceeb8178a9bc5d00897944ff186656a0
Author: Furquan Shaikh 
Date:   Thu Jul 16 12:25:01 2015 -0700

arm64: Set LOG_LEVEL=0 for BL31 if coreboot does not use serial

Even if DEBUG=0, BL31 puts NOTICE(..) messages on serial console. Set
    LOG_LEVEL=0 if coreboot does not use serial.

BUG=None
    BRANCH=None
    TEST=Compiles successfully and no console output from bl31 for
    production images.

Change-Id: Ie77bcac3e2a0d314545b6811327c413536c77fb9
    Signed-off-by: Patrick Georgi 
    Original-Commit-Id: e8e3bcbf6249c80850a87dd66f34d3ff36158641
    Original-Change-Id: I1415a3816cd2fa9dd05bcbd36ac0abc3f2759960
    Original-Signed-off-by: Furquan Shaikh 
    Original-Reviewed-on: https://chromium-review.googlesource.com/286150
    Original-Tested-by: Furquan Shaikh 
    Original-Reviewed-by: Julius Werner 
    Original-Commit-Queue: Furquan Shaikh 
    Original-Trybot-Ready: Furquan Shaikh 
    Reviewed-on: http://review.coreboot.org/11014
    Reviewed-by: Furquan Shaikh 
    Tested-by: build bot (Jenkins)

See http://review.coreboot.org/11014 for details.

-gerrit