A follow-up change will combine the setters for ulpfec and red payload
types, since they're entwined.
Bug: webrtc:11993
Change-Id: Ifea7fe9f4ebc7ac88a62db6cd6748f4d3c20db4c
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/271482
Reviewed-by: Rasmus Brandt <brandtr@webrtc.org>
Commit-Queue: Tomas Gunnarsson <tommi@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#37785}