Split out some dependencies from the monolith audio processing target

This is a first step to make the transient suppressor and voice detection optional.

Bug: webrtc:11226, webrtc:11292
Change-Id: I203125e11694a957a32bc7f98f3bec3ec8867839
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/166523
Reviewed-by: Per Ã…hgren <peah@webrtc.org>
Commit-Queue: Sam Zackrisson <saza@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#30783}
diff --git a/modules/audio_processing/include/audio_processing.cc b/modules/audio_processing/include/audio_processing.cc
index 30d025d..8854415 100644
--- a/modules/audio_processing/include/audio_processing.cc
+++ b/modules/audio_processing/include/audio_processing.cc
@@ -62,6 +62,8 @@
 
 }  // namespace
 
+constexpr int AudioProcessing::kNativeSampleRatesHz[];
+
 void CustomProcessing::SetRuntimeSetting(
     AudioProcessing::RuntimeSetting setting) {}