Reconcile headsetservice with OMNI - their error handling in updateDSP seems alot more solid, and I'm sick of my DSPManager bedshitting over bluetooth.

Change-Id: I002af20b1a8aebadb3cd376324addf9c31e5f00c
DSPManager: bulletproofiing

Change-Id: I5ab8fcb18b5ed86504b9e160a4269cf61b448ca8