ExperimentalNs removed + APM not depending anymore on webrtc::Config

Thanks to the elimination of `ExperimentalNs`, there is no need anymore
to pass `webrtc::Config` to build APM.
Hence, `AudioProcessingBuilder::Create(const webrtc::Config&)` is also
removed.

Bug: webrtc:5298
Change-Id: I0a3482376a7753434486fe564681f7b9f83939c5
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/232128
Reviewed-by: Sam Zackrisson <saza@webrtc.org>
Commit-Queue: Alessio Bazzica <alessiob@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#35025}

modules/audio_processing/audio_processing_impl.cc

@@ -234,9 +234,8 @@ bool AudioProcessingImpl::SubmoduleStates::HighPassFilteringRequired() const {
          noise_suppressor_enabled_;
 }
 
-AudioProcessingImpl::AudioProcessingImpl(const webrtc::Config& config)
-    : AudioProcessingImpl(config,
-                          /*capture_post_processor=*/nullptr,
+AudioProcessingImpl::AudioProcessingImpl()
+    : AudioProcessingImpl(/*capture_post_processor=*/nullptr,
                           /*render_pre_processor=*/nullptr,
                           /*echo_control_factory=*/nullptr,
                           /*echo_detector=*/nullptr,
@@ -245,7 +244,6 @@ AudioProcessingImpl::AudioProcessingImpl(const webrtc::Config& config)
 int AudioProcessingImpl::instance_count_ = 0;
 
 AudioProcessingImpl::AudioProcessingImpl(
-    const webrtc::Config& config,
     std::unique_ptr<CustomProcessing> capture_post_processor,
     std::unique_ptr<CustomProcessing> render_pre_processor,
     std::unique_ptr<EchoControlFactory> echo_control_factory,
@@ -300,12 +298,6 @@ AudioProcessingImpl::AudioProcessingImpl(
     submodules_.echo_detector = rtc::make_ref_counted<ResidualEchoDetector>();
   }
 
-#if !(defined(WEBRTC_ANDROID) || defined(WEBRTC_IOS))
-  // TODO(webrtc:5298): Remove once the use of ExperimentalNs has been
-  // deprecated.
-  config_.transient_suppression.enabled = config.Get<ExperimentalNs>().enabled;
-#endif
-
   Initialize();
 }