Aperture: Fix flash button not being available at app start

* CameraController.cameraInfo is still initializing while we're setting up UI, resulting in hasFlashUnit() returning false
* Get a CameraInfo object from CameraProvider, will be useful in the future once we'll move to camera ID based camera selection

Change-Id: Iae8cfbbdeb063934c756d96ba2708862fc5ed0e6
2 files changed