Forward LossNotification from RTCPReceiver to EncoderRtcpFeedback

TBR=sprang@webrtc.org

Bug: webrtc:10501
Change-Id: I09a571a65ba8515b027ee32d1f46e5cc7f699704
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/131325
Reviewed-by: Elad Alon <eladalon@webrtc.org>
Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
Commit-Queue: Elad Alon <eladalon@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27513}

test/fuzzers/rtcp_receiver_fuzzer.cc

@@ -40,7 +40,7 @@ void FuzzOneInput(const uint8_t* data, size_t size) {
   SimulatedClock clock(1234);
 
   RTCPReceiver receiver(&clock, false, nullptr, nullptr, nullptr, nullptr,
-                        nullptr, kRtcpIntervalMs, &rtp_rtcp_module);
+                        nullptr, nullptr, kRtcpIntervalMs, &rtp_rtcp_module);
 
   receiver.IncomingPacket(data, size);
 }