rtp_rtcp_format is lighter build target than rtc_media_base and a more natural place to keep rtp parsing functions. Bug: None Change-Id: Ibcb5661cc65edbdc89a63f3e411d7ad1218353cc Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/226330 Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> Reviewed-by: Niels Moller <nisse@webrtc.org> Reviewed-by: Henrik Boström <hbos@webrtc.org> Cr-Commit-Position: refs/heads/master@{#34504}