ASoC: cs43130: Replace scnprintf() with sysfs_emit()

sysfs_emit() is a new helper to simplify the sysfs string output.
Replace the open-code straightforwardly with this new helper.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/r/20220801170108.26340-2-tiwai@suse.de


Signed-off-by: Mark Brown <broonie@kernel.org>