ASoC: SOF: ipc4-topology: Add a new helper function to get the valid bits

Add a new helper function sof_ipc4_get_valid_bits() to get the valid
bits in the PCM params.

Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Link: https://lore.kernel.org/r/20230515103336.16132-7-peter.ujfalusi@linux.intel.com


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