Merge "[qrcode] Open any available camera if back camera isn't available."...

Merge "[qrcode] Open any available camera if back camera isn't available." into rvc-dev am: 8776749e am: d6b68cb3 am: 8917715f am: c4e8b382

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Settings/+/12006805

Change-Id: I60a80788887e25d1296bffd3aff200763b6c8678