ALSA: hda: Add missing parameter description for snd_hdac_stream_timecounter_init()

Add the missing description for the new parameter "start" of
snd_hdac_stream_timecounter_init() in the previous patch.

Fixes: df521561 ("ALSA: hda: fix trigger_tstamp_latched")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202410031300.ecLmATNd-lkp@intel.com/
Link: https://patch.msgid.link/20241003072420.8932-1-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/hda/hdac_stream.c

@@ -657,6 +657,7 @@ static void azx_timecounter_init(struct hdac_stream *azx_dev,
  * snd_hdac_stream_timecounter_init - initialize time counter
  * @azx_dev: HD-audio core stream (master stream)
  * @streams: bit flags of streams to set up
+ * @start: true for PCM trigger start, false for other cases
  *
  * Initializes the time counter of streams marked by the bit flags (each
  * bit corresponds to the stream index).