Set the use of the headphone output volume boost.
#include <audio/audio_manager_volume.h>
int audio_manager_set_headphone_volume_boost(bool enable)
true if the extra volume boost is allowed, false otherwise.
The audio_manager_set_headphone_volume_boost() function sets the enable status of the headphone output level to allow an extra volume boost to the headphone output.
A process must have either an effective user ID of root, or the authman capability of access_audio_manager, to use this function.
Note that this function is intended for use by system components. Therefore, it is not suitable for all applications.
EOK upon success, negative errno upon failure.