ASoC: SOF: core: Print out the value of sof_debug if it is set

The sof_debug value is set by the user, developer intentionally.
To save time on figuring out what value has been passed to the kernel by
the user, developer, print it out if it is not 0.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Daniel Baluta <daniel.baluta@nxp.com>
Link: https://lore.kernel.org/r/20221216115435.28427-1-peter.ujfalusi@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>