AVAudioSession category is set to playback when communication role is set.

When audio is set active in audiounit_ios.m the category is changed to AVAudioSessionCategoryPlayback and the mode is set to AVAudioSessionModeMoviePlayback

See: https://code.videolan.org/videolan/vlc/-/blob/master/modules/audio_output/audiounit_ios.m#L400

When the MediaPlayer role is set to communication it is more likely the user would like to use AVAudioSessionCategoryPlayAndRecord.

Suggest adding a couple structs and getters, mode2category and mode2avMode, similar to:

https://code.videolan.org/videolan/vlc/-/blob/master/modules/audio_output/audiounit_ios.m#L365

that sets the category to AVAudioSessionCategoryPlayAndRecord and the mode to AVAudioSessionModeVoiceChat if the media player has the communication role.