Changes

lm: Initialize layer manager also on role=SG

Right now the LM will stay in IDLE for role=SG, but it already provides
with an easier logic where all xUA ASPs (no matter their role) have an
associated FSM object, which can be extnded later on.
This way we already valdiate the FSM instance lifecycle wroks as
expected.
It also allows in the future more easily integrating the LM in role
IPSP, where it will need to be extended.

Change-Id: I1f25cf8371ba72d710796e01a9a967d3fafffb99