Replace VideoReceiveStream::Config with new rtclog::StreamConfig in RtcEventLog.

BUG=webrtc:7538

Review-Url: https://codereview.webrtc.org/2850793002
Cr-Original-Commit-Position: refs/heads/master@{#18220}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 09e71daec503f9983938fd7e621657fc4cff2440