ASoC: simple-card: use asoc_simple_xxx prefix

simple-card driver is using asoc_simple_xxx() prefix.
simple_card_dai_link_of() should be
asoc_simple_card_dai_link_of().

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>