captureStillPicture for pich zoom

[surabhi-1694]

i am trying to capture image with captureStillPicture() after pich zoom in order to get zoom image by pich zoom i had to call captureBuilder.set(CaptureRequest.SCALER_CROP_REGION, pinchZoomRect) // where pinchZoomRect is calculated zoom rect from touch event
THe problem is if i set this captureBuilder.set(CaptureRequest.SCALER_CROP_REGION, pinchZoomRect) in captureStillPicture() in for loop ; mOnImageAvailableListener does not call properlly for 4 times it either call only once or twice