Add Matt to mainline modularization owners

Change-Id: Iee6ef23d693e7a33efbfe9a89c3f6fbcd7125a84
diff --git a/OWNERS b/OWNERS
index 36928eb..8e69b01 100644
--- a/OWNERS
+++ b/OWNERS
@@ -9,6 +9,7 @@
 harshitmahajan@google.com
 hsnali@google.com
 kalyssa@google.com
+mattcarp@google.com
 paulduffin@google.com
 pedroql@google.com
 robertogil@google.com