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