android: utils: remove AWindow_SurfaceTexture

The AWindow_ID is not used anymore since we moved the creation of
SurfaceTexture to the usage site. We also don't need to store the
SurfaceTexture in the AWindowHandler anymore.

This finally makes the SurfaceTexture independant of the AWindowHandler
and cleanup previous patches.
14 jobs for !13 with android/refactor-3/5 in 69 minutes and 1 second (queued for 3 seconds)
merge request