Add external camera support am: d66d2cfcf2 am: a2ccd8ac06 am: 4187ba2cda am: 6466bbb1ef am: ffe873eb44

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Camera2/+/11604391

Change-Id: I88494fd6e71d94ab7534b77b239f753d18512217