SnapdragonCamera:Fix can't take picture

When the sensor gets turn off in settings, launching
camera will be slower and cause mPreviewRect not set.
Set mPreviewRect again by invoking setPreviewSize
when camera is opened.

Change-Id: I7923320ab4a54ae2194f84b40f60a33b581d5eae
CRs-Fixed: 1062228
1 file changed