ASoC: omap: 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 the open code
with new helpers, sysfs_emit() and sysfs_emit_at(), with the proper
string offset.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Acked-by: Peter Ujfalusi <peter.ujfalusi@gmail.com>
Link: https://lore.kernel.org/r/20220801170108.26340-9-tiwai@suse.de


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