ALSA: hda: add AW88399 side codec support

[Lyapsus]

• Introduce a full HDA-side codec path for AW88399 smart amps so Legion-class systems can drive their woofers without the SOF/SSP glue: new aw88399_hda{,_i2c}.c handle ACPI/SMI instantiation, firmware loading via the reused ASoC core, and bind into the HDA component framework with runtime PM, playback hooks, Legion-specific channel swap, and ACPI metadata parsing.
• Teach the Realtek ALC287 driver to build two AW88399 components on Lenovo 17aa:3906/3907 machines by adding a dedicated fixup, HDA component wiring, and the necessary Kconfig/Makefile/plumbing so the side-codec autoloads.
• Extend the generic infrastructure so this HDA flow coexists with the old SSP driver: export the AW88399 core helpers, add strict hw_params validation, improve channel detection and start/stop handling in the ASoC codec, drop its ACPI match to avoid binding races, and allow ACPI/SMI to enumerate the amps via new entries in drivers/acpi/scan.c and serial-multi-instantiate.

[sofci]

Can one of the admins verify this patch?

reply test this please to run this test once

[kv2019i]

@Lyapsus Great to see progress on this! It is good this hw turned out to be similar to existing hardware and not a directly exposed as I2S to SoC DSP (this would have been a totally new hw design, and less code to reuse in upstream).

As SOF is no longer used, this should be sent directly to sound subsystem via [email protected] . This github project is only used to stage patches to linux/sound/soc/sof/

[Lyapsus]

@kv2019i sounds reasonbale haha. Gotta go there then. Thanks a lot!