hal: fix mutex unlock issue

If a audio/voice usecase is active, hal should re-try the speaker
calibration.Speaker portection mutex was not being unlocked for this
usecase which causes ANR.Change unlocks the mutex which fixes the issue.

CRs-fixed: 671620
Change-Id: Ic29697e29e96dba784941f4e29664b8c10f51e84
1 file changed