CameraService: Fill in missing facing information in Treble path

getDeviceVersion(), for whatever reason, also optionally returns the
facing of the specified camera device.  The latter part was left
out of the Treble path implementation, resulting in incorrect
display orientation calculations higher up the chain.

Also add checks for invalid facings returned by getDeviceVersion so
that error logs will point this out next time.

Test: Manual inspection: API1-based applications do not have upside-
  down preview. API1 CTS passes.
Bug: 34816614
Change-Id: Ice4c644e504f59e7df9be6636d9e6a3b38c52d4b