Add drosen to OWNERS

Test: build/make/tools/checkowners.py -c -v system/vold/OWNERS
Change-Id: Ic774577a0368f8cdbeb043f8021aec7457198276
diff --git a/OWNERS b/OWNERS
index 6c5c150..7779c20 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,4 +1,6 @@
 jsharkey@android.com
 paulcrowley@google.com
 paullawrence@google.com
-ebiggers@google.com
\ No newline at end of file
+ebiggers@google.com
+drosen@google.com
+