Add myself (cc) as a src commiter.

Summary: Adding mentor relationships for cc when committing new diffs.

Reviewers: rscheff, tuexen
Subscribers: imp
Reviewed by: rscheff (mentor), tuexen (mentor)
Approved by: rscheff (mentor), tuexen (mentor)
MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D39342