Add lpy@ to tracing/OWNERS
Add lpy@ to tracing/OWNERS

lpy has landed a lot of large pieces of code, and I trust their review.

Review-Url: https://codereview.chromium.org/2855343003

catapult-project/catapult-csm,benschmaus/catapult,catapult-project/catapult,benschmaus/catapult,catapult-project/catapult-csm,catapult-project/catapult-csm,catapult-project/catapult-csm,catapult-project/catapult,benschmaus/catapult,catapult-project/catapult,benschmaus/catapult,benschmaus/catapult,catapult-project/catapult-csm,catapult-project/catapult,catapult-project/catapult-csm,catapult-project/catapult-csm,catapult-project/catapult,benschmaus/catapult,catapult-project/catapult,benschmaus/catapult,catapult-project/catapult