Add myself (cc) as a src commiter.

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

Reviewed by: rscheff (mentor), tuexen (mentor)
Approved by: rscheff (mentor), tuexen (mentor)
Differential Revision: https://reviews.freebsd.org/D39368

(cherry picked from commit 95940a2d2442c4ae47013b8ddb5bfb8bb5e40b39)