ASoC: atmel: atmel-classd: Use str_enabled_disabled() helper

Remove hard-coded strings by using the str_enabled_disabled() helper
function.

Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Reviewed-by: Andrei Simion <andrei.simion@microchip.com>
Link: https://patch.msgid.link/20250222225925.539840-2-thorsten.blum@linux.dev


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