ASoC: Address remaining PCM constraint issues

bui duc phuc <phucduc.bui@gmail.com> says:

Since v1 has already been applied, this series provides incremental
changes to address the remaining items from v2:
 - Add comments explaining why .open() and .startup() must return 0
   on success to prevent the issue from being reintroduced.
 - Add Reviewed-by tags from Vijendar Mukunda and Chancel Liu,
   and Acked-by tags from Morimoto-san and Cezary.
 - Remove redundant integer constraints already applied
   by snd_dmaengine_pcm_open().

Link v1:
https://lore.kernel.org/all/20261008103831.542533-1-phucduc.bui@gmail.com/
Link v2:
https://lore.kernel.org/all/20261015014324.5569-1-phucduc.bui@gmail.com/

Compile-tested only.

Link: https://patch.msgid.link/20261016040946.521195-1-phucduc.bui@gmail.com

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