Code owner change for the Hexagon backend

I am leaving Qualcomm, and so I am no longer the best person to own the Hexagon backend. The person I’d like to take it over is Sundeep Kushwaha. Sundeep may not have been very active in the upstream community so far, but he has been very much involved with the Hexagon toolchain within Qualcomm. He was actually one of the original authors of the Hexagon backend.

Please let me know if you have any questions or concerns.