Camera2: Burst mode

Camera: Add Burst mode
Change-Id: I867e26a359ae11b82637d9d239a49679b7e0eb76
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