Switch to use 32 kHz processing inside APM

This CL switches to using 32 kHz processing internally inside WebRTC APM
to avoid using the current 3-band split filter which has been shown to
have issues with aliasing impacting the speech quality.

The intention is to revert this change once the issues in the 3-band
split filter have been addressed.

Bug: webrtc:454695115
Change-Id: Id87e7f8d2ba37a915b3640f7eeb5c996037c59aa
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/419860
Commit-Queue: Per Åhgren <peah@webrtc.org>
Reviewed-by: Henrik Lundin <henrik.lundin@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#46026}