Remove trong@ from OWNERS

Cleaning up the OWNERS file for those who are no longer on the team.

Test: The ghost of trong@'s account cannot approve changes in this
repository
Change-Id: Ib777c16b53691f82de5bea33bd3cc363a8720982

Change-Id: I6c2bcdbfc6177b5d8e9416a5b93edf7e5e8a2b5b
1 file changed