ASoC: atmel: use devm_snd_soc_register_card()

Let's use devm_snd_soc_register_card() instead of snd_soc_register_card()
and ignore snd_soc_unregister_card()

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://msgid.link/r/87wmsgwv4r.wl-kuninori.morimoto.gx@renesas.com


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