ASoC: rt*: Constify static struct snd_soc_dai_ops

ASoC: rt*: Constify static struct snd_soc_dai_ops

The only usage of them is to assign their address to the ops field in
the snd_soc_dai_driver struct, which is a pointer to const. Make them
const to allow the compiler to put them in read-only memory.

Signed-off-by: Rikard Falkeborn <rikard.falkeborn@gmail.com>
Link: https://lore.kernel.org/r/20210224211918.39109-3-rikard.falkeborn@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>