firmware: cs_dsp: Add a debugfs entry containing control details

firmware: cs_dsp: Add a debugfs entry containing control details

The file named 'controls' in the DSP's debugfs root contains a
formatted table describing the controls defined within the loaded DSP
firmware, it is of the form

  name: len region:offset addr fwname algid ctltype flags en dirty

Where flags is represented as a character for each flag if set, or '-',
enabled is whether the control is enabled or disabled and dirty is
whether the control value is set in the cache but not the hardware.

Signed-off-by: Simon Trimmer <simont@opensource.cirrus.com>
Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20230328131018.6820-1-rf@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>