ASoC: Rework the SDCA HID code

Charles Keepax <ckeepax@opensource.cirrus.com> says:

This series reworks the SDCA HID code, the primary goals being to no
longer store runtime HID data in the DisCo data structures and remove
the need to pass the soundwire device into the ACPI parsing code.

To achieve this the HID device registration is moved to the IRQ work
flow rather than the ACPI work flow.

Also a few small issues are fixed up along the way, some formatting,
some missing cleanup/docs.

Link: https://patch.msgid.link/20260805124205.4152543-1-ckeepax@opensource.cirrus.com