ALSA: hda: Use hdac_ext prefix in snd_hdac_stream_free_all() for clarity

ALSA: hda: Use hdac_ext prefix in snd_hdac_stream_free_all() for clarity

Make sure there's no ambiguity on layering with the appropriate prefix
added.

Pure rename, no functionality changed.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Link: https://lore.kernel.org/r/20220919121041.43463-5-pierre-louis.bossart@linux.intel.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>