Camera: Disable HDR when scene mode is other than auto

- HDR option is enabled even when scene mode is not auto.
  Due to this preview and snapshot are still remain in previous
  scene mode after enabling HDR.

- Fix is to disable the HDR when scene mode is other than auto.

Change-Id: Icec96816a7ed6f3daacc8b79841dee5db6b4b04a
CRs-Fixed: 648847