audio: volume: Memory, blob, and fast_get allocs to module API

[jsarha]

Allocate all memory, blob handlers, and fast_get() buffers through module API mod_alloc() and friends.

[Copilot]

Pull Request Overview

This PR transitions the volume module to use the module API's automatic memory management system. By replacing manual memory allocation functions (rzalloc, rmalloc, rfree) with module API equivalents (mod_zalloc, mod_alloc), the code leverages automatic cleanup when the module unloads, eliminating the need for manual cleanup in error paths and the free function.

Key changes:

• Replaced manual memory allocation with module API allocation functions
• Removed manual memory deallocation from error paths and cleanup functions
• Removed the now-unused rtos/alloc.h include

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
src/audio/volume/volume_ipc4.c	Converted memory allocations to mod_alloc/mod_zalloc and removed manual cleanup calls
src/audio/volume/volume_ipc3.c	Converted memory allocations to mod_alloc/mod_zalloc and removed manual cleanup calls
src/audio/volume/volume.c	Removed manual rfree() calls from volume_free() function

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[lgirdwood]

SOFCI TEST

[jsarha]

This new version of volume module using module API to allocate resources still has all the resource freeing code in place.

[lgirdwood]

@softwarecki fyi - now keeps the free.

[lgirdwood]

@lrudyX good to merge ? other CI looks good.

[softwarecki]

Keeping mod_free as-is, we have a plan to make tracking optional, so I don't see any blockers.