ASoC: SOF: Intel: lnl: Add fw_regs area to debugfs map

Expose the firmware registers via debugfs. it can be of great help while
debugging complex issues.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://msgid.link/r/20240409113349.21623-4-peter.ujfalusi@linux.intel.com


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