hal: enable speaker protection on APQ8084

-Enable speaker protection compilation flag to support
 speaker protection feature for audio playback and voice
 calls on APQ8084
-Append speaker-protected backend name to usecase only
 for APQ8084 to differentiate with regular voice call as
 routing controls are different.

Change-Id: I92ed26c9df0dc2f152e2bbf8b29362e32fff9844