Camera: Dont process dataCalllback if recording is stopped

Issue: Here stopRecording is not finished as the previous
recording frame process has not completed. dataCallbackTimeStamp()
in CameraSource.cpp has stuck in the thread itself waiting for a lock.
In between, reset() function in CameraSource.cpp has called
and acquired lock. Reset() function calls stopRecording.
So the dataCallbackTimeStamp() is continuously waiting.
Unless dataCallbackTimeStamp returns, processRecordFrame
in HAL will not finish.

CRs-Fixed: 518351

Change-Id: I19bbdb4b50b0113a419c9229f0e26c56e8ce91e8