Fix for unusable camera after quick pause/resume and HDR+ switch (camera-Haleakala)

- Removing the hack for b/18854352
- Running the camera reopen camera operations and onReadyForCapture callback in a non-UI thread to avoid dead-locks

Bug: 21025113
Change-Id: I5545148769d92e5a87ffa9b693397fd7737edee6
2 files changed