Add a VideoCoding::RegisterReceiveCodec method with payload_type

Intended to ease removal of VideoCodec::plType, separating video
coding from transport.

Bug: None
Change-Id: I0764f2f714eab9ee4c3e55751819cd5915fb37b6
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/181075
Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#31892}

modules/video_coding/video_coding_impl.h

@@ -60,7 +60,8 @@ class VideoReceiver : public Module {
   VideoReceiver(Clock* clock, VCMTiming* timing);
   ~VideoReceiver() override;
 
-  int32_t RegisterReceiveCodec(const VideoCodec* receiveCodec,
+  int32_t RegisterReceiveCodec(uint8_t payload_type,
+                               const VideoCodec* receiveCodec,
                                int32_t numberOfCores);
 
   void RegisterExternalDecoder(VideoDecoder* externalDecoder,