ASoC: sh: make snd_pcm_hardware const

Make these const as they are only passed as the 2nd argument to the
function snd_soc_set_runtime_hwparams, which is const.
Done using Coccinelle.

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