ASoC: SOF: sof-pci-dev: Update the ipc_type module parameter description

ASoC: SOF: sof-pci-dev: Update the ipc_type module parameter description

Clarify the description of the ipc_type module parameter and drop the Intel
CAVS in favor of IPC4.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Daniel Baluta <daniel.baluta@nxp.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20230919104226.32239-3-peter.ujfalusi@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>