Camera: Restart Preview for HDR & NON-HDR transitions

* HDR mode uses non-zsl mode, therefore preview needs to be
  restarted every time we change between HDR & non-HDR scene
  modes.

* Also removed setCameraMode mode in setparameters.
  Firstly because this is not exposed to the APP, secondly
  since subsequent calls keep setting the value which was used
  in initDefaultParameters, thereby overriding our selection for
  myMode which was based on HDR and NON-HDR mode.

* Map HDR Scene mode to BESTSHOT AUTO

Change-Id: I20b399dd58b344dedc7388f83e76ad4a3874dab8
4 files changed