vout/android: change android-display priority
vout/android: change android-display priority

This allow us to use a different vout to render VLC_CODEC_ANDROID_OPAQUE in
regards of the video_format_t:

 - opaque android-display: priority of 280: do direct rendering on a
   SurfaceView, will fail if there is a projection to handle (360 videos).

 - gles2: priority of 265: do direct rendering on a SurfaceTexture created from
   an OpenGL Texture, can handle projection.

 - android-display: priority of 260: will fail for VLC_CODEC_ANDROID_OPAQUE.

The gles2 module has a little overhead for VLC_CODEC_ANDROID_OPAQUE. It does
one JNI->Java/synchronize/wait per frame. That's why it's not used by default
(but I wasn't able to see any significant differences on the devices I tested).

xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc