ASoC: soc-pcm: Shrink stack frame for __soc_pcm_hw_params

ASoC: soc-pcm: Shrink stack frame for __soc_pcm_hw_params

Commit ac950278b087 ("ASoC: add N cpus to M codecs dai link support")
added an additional local params in __soc_pcm_hw_params, for the CPU
side of the DAI. The snd_pcm_hw_params struct is pretty large (604
bytes) and keeping two local copies of it can make the stack frame
really large.

It is worth noting the variables are in separate code blocks so for
some optimisation levels in the compiler these will get automatically
combined keeping the stack frame reasonable. But better to manually
combine them to cover all cases.

Add a single local variable for __soc_pcm_hw_params and use in both
loops to shrink the stack frame.

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20230908085920.2906359-1-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>