Camcorder: Set video torch mode by user preference

Set flash mode regarding to user's preference instead
of obscure setting by UI visibility.

Change-Id: Ia134b86885eda1ad50d510e67e5595a391326d10
CRs-fixed: 567295
Camera: Add support for 4K camcorder

In case 4k is enabled,
 (a) set the preview resoultion same as video resolution.
 (b) set the preview format same as video format.

Change-Id: Iebc4c7d47ddca6e03a72f3af7b4660e93c9a1b8e