submodules: add arm-trusted-firmware third-party repository

Change-Id: I080c0a5954d3e4b2d6debdf2a77f32df7329841c
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: http://review.coreboot.org/10565
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins)
Reviewed-by: Marc Jones <marc.jones@se-eng.com>
2 files changed