Update arm-trusted-firmware submodule to upstream master

Updating from commit id 3944adca:
2017-03-18 12:16:27 +0000 - (Merge pull request #861 from soby-mathew/sm/aarch32_fixes)

to commit id b1187232:
2017-06-20 15:34:54 +0100 - (Merge pull request #992 from davidcunado-arm/dc/fix-signed-comparisons)

This brings in 373 new commits.

Change-Id: I653007f664921305d22645f7904bb2d8eb85fe67
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/20701
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
1 file changed