ASoC: SOF: IPC4: clarify 'pipeline_ids' usage and logs

ASoC: SOF: IPC4: clarify 'pipeline_ids' usage and logs

A pipeline is identified by two indices: 'instance_id' and 'pipeline_id'

This is clearly seen in kernel logs when creating a pipeline

"Create widget pipeline.20 instance 0 - pipe 20 - core 0"

but other logs are less clear

"ipc4 set pipeline 1 state 4"

Change definitions and logs to make sure the logs clearly identify
which of the two indices are used in state transitions.

No functional change.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Link: https://lore.kernel.org/r/20230807210959.506849-20-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>