Add myself as the the code owner for the AVR backend

Summary:
As I maintain the AVR backend and am currently in the process of migrating it in tree, it makes sense to add myself as the code owner.

Thoughts welcome!

Differential Revision: http://reviews.llvm.org/D14002

llvm-svn: 251471
GitOrigin-RevId: a3eda371ec364a4339325955ab4e3eed98cfa772
1 file changed