Check whether the mirror mode of the HDMI settings is on.
#include <audio/audio_manager_device.h>
int audio_manager_is_hdmi_in_mirror_mode(bool *mirror_mode)
true if the HDMI is set to mirror mode, false otherwise.
The audio_manager_is_hdmi_in_mirror_mode() function checks whether the HDMI is currently set to mirror mode.
EOK upon success, negative errno upon failure.