ASoC: ak4613: tidyup ak4613_interface

ak4613 driver is assuming symmetric format.
Thus, we don't need to have asymmetric table for judging the
iface at .hw_param.

This patch cleanup ak4613_interface for it.
This is prepare for TDM support.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87ee2cp9lz.wl-kuninori.morimoto.gx@renesas.com


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