Revert "build: clean up modules audio build files"

This reverts commit 246b8dee2304df4a20513f595e315a0ca3df079c.

Reason for revert: Breaks downstream project

Original change's description:
> build: clean up modules audio build files
>
> using gn_check_autofix with cherry-picking removals
>
> Bug: webrtc:467294026
> Change-Id: Ia8fe74995724c193d7e92db1ed3e26d77e34422a
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/460060
> Reviewed-by: Christoffer Dewerin <jansson@webrtc.org>
> Reviewed-by: Jeremy Leconte <jleconte@google.com>
> Commit-Queue: Philipp Hancke <philipp.hancke@googlemail.com>
> Cr-Commit-Position: refs/heads/main@{#47263}

Bug: webrtc:467294026
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Change-Id: Ia13ae59ae025dbf9a6ca28922d061c2d6c1441c2
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/460460
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#47268}