Adding more refined control over choice of band-splitting

This CL allows the user to have more refined control over what band
splitting-scheme is used inside the audio processing module.


Bug: webrtc:6181
Change-Id: I236c3b1f96ab80cc4ffb8c39c045c034764567a1
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/152480
Commit-Queue: Per Åhgren <peah@webrtc.org>
Reviewed-by: Gustaf Ullberg <gustaf@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29189}

modules/audio_processing/test/audio_processing_simulator.h

@@ -81,6 +81,7 @@ struct SimulationSettings {
   absl::optional<float> pre_amplifier_gain_factor;
   absl::optional<int> vad_likelihood;
   absl::optional<int> ns_level;
+  absl::optional<int> maximum_internal_processing_rate;
   absl::optional<bool> use_refined_adaptive_filter;
   int initial_mic_level;
   bool simulate_mic_gain = false;