ASoC: SOF: pcm: Reverse check for prepared stream in sof_pcm_hw_params()

Reduce the number of checks needed with the simple and most common audio
sequence when the stream is started then stopped.

If the stream has not been prepared there is no need to check if we have
pcm_ops and pcm_ops->hw_free() callback as it does not matter.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Link: https://patch.msgid.link/20250619104551.25912-1-peter.ujfalusi@linux.intel.com


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