cm: Fix Trusted Face

Trusted Face depends on libprotobuf-cpp-full.
Some devices already ship it (eg RIL needs it).

Include it here to build it for every device.

Link to OpenGapps issue:
https://github.com/opengapps/opengapps/issues/390



Change-Id: Iffee0aa6218dfef45f5cd728a999fa1114c0dd57
Signed-off-by: Alexander Martinz <eviscerationls@gmail.com>