ASoC: SOF: ipc4: Add sof_ipc4_pipeline_state_str() for debugging

ASoC: SOF: ipc4: Add sof_ipc4_pipeline_state_str() for debugging

Add sof_ipc4_pipeline_state_str() to translate enum
sof_ipc4_pipeline_state into human readable form.

Signed-off-by: Jyri Sarha <jyri.sarha@linux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Reviewed-by: Liam Girdwood <liam.r.girdwood@intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Link: https://patch.msgid.link/20250619121121.25241-2-peter.ujfalusi@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>