firmware: cs_dsp: Add KUnit testing of client callbacks

Test that the cs_dsp_client_ops callbacks are called when expected.

pre_run, post_run - when cs_dsp_run() is called.
pre_stop, post_stop - when cs_dsp_stop() is called
control_add - when a WMFW is loaded
control_remove - when cs_dsp_remove() is called

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Link: https://patch.msgid.link/20241212143725.1381013-13-rf@opensource.cirrus.com


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