[Cleanup] Add missing #include. Remove useless ones.

This CL is the result of running include-what-you-use tool on part
of the code base (audio target and dependencies) plus manual fixes.

bug: webrtc:8311
Change-Id: I277d281ce943c3ecc1bd45fd8d83055931743604
Reviewed-on: https://webrtc-review.googlesource.com/c/106280
Commit-Queue: Yves Gerey <yvesg@google.com>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Patrik Höglund <phoglund@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25311}

api/rtptransceiverinterface.h

@@ -16,9 +16,12 @@
 
 #include "absl/types/optional.h"
 #include "api/array_view.h"
+#include "api/mediatypes.h"
+#include "api/rtpparameters.h"
 #include "api/rtpreceiverinterface.h"
 #include "api/rtpsenderinterface.h"
 #include "rtc_base/refcount.h"
+#include "rtc_base/scoped_ref_ptr.h"
 
 namespace webrtc {