Remove mitchp from OWNERS file

Change-Id: Ifb0e1598f3908fcc2206a2b51611b996f8b48cb8
diff --git a/init/test_upgrade_mte/OWNERS b/init/test_upgrade_mte/OWNERS
index 79625df..c95d3cf 100644
--- a/init/test_upgrade_mte/OWNERS
+++ b/init/test_upgrade_mte/OWNERS
@@ -1,5 +1,4 @@
 fmayer@google.com
 
 eugenis@google.com
-mitchp@google.com
 pcc@google.com