ASoC: SOF: loader: Use the generic ops for region debugfs handling

Do not access the sdev->bar[] directly to make the code generic, use the
new generic ops for handing the regions for debugfs.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Daniel Baluta <daniel.baluta@gmail.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Link: https://lore.kernel.org/r/20210915122116.18317-12-peter.ujfalusi@linux.intel.com


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