Register RTP/RTCP modules outside rtp_rtcp_cs_.

Prevents deadlock between the process thread and SetSendCodec calls.

BUG=4542
R=mflodman@webrtc.org, stefan@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/45179004

Cr-Commit-Position: refs/heads/master@{#9018}
1 file changed