audio/alsa-plugins: revert ffmpeg workaround

Not a leaf consumer. Depending on ffmpeg4 can cause bustage or crashes
in ffmpeg consumers.

PR: 271641 272337

This reverts commit ca82785515c8ecfa4bab73b7539a688c343f327e.

(cherry picked from commit 38462c18edacfc7e912783cb164065eab8d38be2)