ASoC: SOF: probes: rename assign/free callbacks as startup/shutdown

ASoC: SOF: probes: rename assign/free callbacks as startup/shutdown

assign/free are not well aligned to usual conventions and specifically
not to the compressed ops that make use of the probe callbacks.

Use the more common startup/shutdown. No functional change beyond
renaming.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20220715145216.277003-11-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>