ASoC: codecs: make snd_compr_ops const

Make these const as they are only stored in the compr_ops field of a
snd_soc_platform_driver structure, which is of type const.
Done using Coccinelle

Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>