ASoC: SOF: ipc and dsp dump: Add markers for better visibility

Add markers to identify the start and end of the IPC and DSP dumps in the
kernel log.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.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/20211006110645.26679-4-peter.ujfalusi@linux.intel.com


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