msm: camera: bug fixes in sensor start and wait error handling

- If the wait_event_interruptible_timeout() returns with
  error code ERESTARTSYS retry the wait action
- If the queried FPS is zero the delay needs to be
  set to the minimum delay

Change-Id: I4b091d0926a3d0d04a3c63190c86aca24e553b70
Signed-off-by: Mingcheng Zhu <mingchen@codeaurora.org>