Add ExynosAuto ABOX generic platform and PCM support

[Mark Brown]

On Mon, Jul 21, 2025 at 11:30:43AM +0900, ew kim wrote:
> This patch series adds the ABOX Generic audio management driver for
> Samsung ExynosAuto SoCs, along with IPC messaging and PCM frontend
> drivers, including their corresponding device tree bindings.
> 
> ### ABOX Architecture Design: Fixed and Variable Structure
> 
> The ABOX audio framework is designed with a clear split between:
> - **Fixed part** (common framework): reusable components across SoCs
>   - Generic ABOX platform driver
>   - IPC messaging handler
>   - PCM frontend with ALSA compressed audio support
>   - Solution manager for dynamic control
> - **Variable part** (SoC-specific): defined via device tree
>   - IRQ numbers, stream IDs, buffer sizes, and ADSP allocation
>   - Defined per PCM/IPC device node in DTS

This all sounds from a system integration point of view like a fairly
standard audio DSP.  Usually something like that would be structured
with the generic bits of DSP support done as a library which the drivers
for specific bits of hardware link to, the SOF code is the most obvious
example of this we have upstream but there's a few other simpler ones
like the Cirrus CODECs.  If there's a reason why this wouldn't work here
it's not clear to me from what you've posted thus far.
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