I was used by ML1 (first gen device) which is deprecated and not
supported anymore. ML2 uses standard Android JNI and NDK.
Note that mlaudiosink element remains in bad/sys/magiclea because it
allows 3d spatial audio and that API is still supported by Magicleap
SDK.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6108>