Check the device policy for the camera disabled flag before trying to

open a connection to the camera.

When the camera is disabled from both the device policy and camera
settings, GCA will not receive onError with ERROR_CAMERA_DISABLED. This
is incorrect behavior which is fixed by this patch.

Bug: 230026863, 203063139
Test: Verified camera app closes when both settings are disabled.
Change-Id: I514b38c23a136994de702ea4aacc9be65ab46d70