SYBF-1663 alsa_audiocore: enable audiocore only if ausrc is used

The audiocore should be used in passthrough mode if only the audio
playback is needed, e.g. for the ringtone. This allows to get rid of the
alsa module on SYBF devices.

(cherry picked from commit 190592e7f71327161796d470fffa0b8cba43425b)

modules/alsa_audiocore/alsa_audiocore.c

@@ -366,7 +366,6 @@ static int play_alloc(struct auplay_st **stp, const struct auplay *ap,
 
 	pthread_mutex_lock(&m->mutex);
 	aubuf_flush(m->play_aubuf);
-	audiocore_enable(true);
 	audiocore_start();
 	m->play = st;
 	m->play_started = true;