ASoC: codecs: wm_adsp: Allow wm_adsp to hibernate without stopping DSP

ASoC: codecs: wm_adsp: Allow wm_adsp to hibernate without stopping DSP

Some parts do not stop the DSP core before runtime suspend, however,
this leaves the DSP controls enabled and accessible whilst the part is
suspended and the regmap is cache_only.

Add new APIs to allow for the DSP to hibernate when the part is
suspended, and the DSP is not shut down.

Signed-off-by: Stefan Binding <sbinding@opensource.cirrus.com>
Reviewed-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Link: https://patch.msgid.link/20260224161821.93365-3-sbinding@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>