Patch merged into coreboot/master: 3rdparty: update arm-trusted-firmware submodule

the following patch was just integrated into master:
commit f34ca46fa65e86e1b5706ab6dbce4c4e5c5f3323
Author: Martin Roth 
Date:   Mon Jan 2 19:55:11 2017 -0700

3rdparty: update arm-trusted-firmware submodule

Updated to arm-trusted-firmware TOT:
    236c27d2 (Merge pull request #805 from Xilinx/zynqmp/addr_space_size)
    183 commits between Sep 20, 2016 and January 10, 2017

- Also add associated change to src/soc/rockship/rk3399 Makefile.inc
    that is required to build the M0 Firmware.

Change-Id: I49695f3287a742cd1fb603b890d124f60788f88f
    Signed-off-by: Martin Roth 
    Reviewed-on: https://review.coreboot.org/18024
    Tested-by: build bot (Jenkins)
    Reviewed-by: Patrick Georgi

See https://review.coreboot.org/18024 for details.

-gerrit