Camera2: Maintain focus mode when using ttf

Add an option to maintain the focus mode when using
touch-to-focus

There's at least one family of camera HALs that gets "confused" when
the focus mode forcefully changes to auto after setting focus /
exposure area options.

Sticking with the current focus mode still results in effective use
of the focus region, so don't force a switch to auto. The default
behavior remains the original, this needs to be explicitly enabled
on affected devices

Change-Id: Icf70eb749cdfadd7c2739e41a9841681f2f3d561
Camera2: Burst mode

Camera: Add Burst mode
Author: Michael Bestas <mikeioannina@gmail.com>

Camera: Add indicator icon for burst mode
* Patchset places burst mode indicator next to auto-scene detect
  if active.
Author: Ethan Chen <intervigil@gmail.com>

Changes by me:
-Pie setting for burst mode instead of menu

Change-Id: I5eb248ae09f159e45e20bea4f11bbaa641fcb015