Add VAAPI drivers for AMD

[rijnhard]

Any chance the image can be updated with VAAPi drivers for AMD?

sudo waydroid logcat | grep -i vaapi
10-02 19:30:30.978   105  3537 D HWACCEL : ffmpeg_hwaccel_init: 0xf74b1000 [h264], hw device = vaapi
10-02 19:30:31.005   105  3537 I FFMPEG  : [h264 @ 0xf74b1000] Failed setup for format vaapi: hwaccel initialisation returned error.
10-02 19:33:09.880   105  3749 D HWACCEL : ffmpeg_hwaccel_init: 0xf74b6000 [h264], hw device = vaapi
10-02 19:33:09.881   105  3749 I FFMPEG  : [h264 @ 0xf74b6000] Failed setup for format vaapi: hwaccel initialisation returned error.

This PR may be useful:
waydroid/android_device_waydroid_waydroid#3

[supechicken]

See #8 (comment)