Remove ghartman@ from OWNERS

Test: gerrit
Change-Id: I5018068d5482dbca59189fb33ac8e09ae5d008eb
diff --git a/OWNERS b/OWNERS
index 8d5a1d7..013be0d 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,2 +1,2 @@
-ghartman@google.com
+adelva@google.com
 include platform/system/core:/janitors/OWNERS