ALSA: pcm: Replace sprintf() with sysfs_emit()

For sysfs outputs, it's safer to use a new helper, sysfs_emit(),
instead of the raw sprintf() & co.  This patch replaces such a
sprintf() call straightforwardly with the new helper.

Link: https://lore.kernel.org/r/20220801165639.26030-6-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>