beckham: Add Moto Camera 2 & priv-app permissions

* Snap APIv2 doesn't support our Aux Cam, or Camera
  Mods (considering they are removable and need special
  HAL handling for flash, internal Camera/USB disabling,
  etc.

* Snap APIv1 doesn't like our front-flash, or video
  recording audio (likely fixable). As well as the
  aforementioned lack of Camera Mod support.

* Mata ships Klik to support an external Camera "mod"
  and sets precedent for shipping OEM Cameras, so we're
  just going to go ahead and do it.

Change-Id: I7d5001e7f743cdb9aaeb70c032a19cc008209135