ASoC: Intel: avs: Lock substream before snd_pcm_stop()

snd_pcm_stop() shall be called with stream lock held to prevent any
races between nonatomic streaming operations.

Fixes: 2f1f570c ("ASoC: Intel: avs: Coredump and recovery flow")
Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
Link: https://lore.kernel.org/r/20221116115550.1100398-2-cezary.rojewski@intel.com


Signed-off-by: Mark Brown <broonie@kernel.org>