Multi HF support

1. Added support for Multi HF connections
in Bluetooth application.
2. All connection transition states for
2nd HS onwards is handled in new state-
MultiHFPending.
3. The changes are done to handle proper
state transition for all connected HS.

Change-Id: I033ae57943e50273f9d3cac4c5f8d1624cb9ee09
6 files changed