Add OWNER for keymaster VTS

Test: TreeHugger
Change-Id: I2ff243a2cadbfcc9bedf634f9a9327b2fa8ccd63
diff --git a/keymaster/4.0/vts/OWNERS b/keymaster/4.0/vts/OWNERS
index abfb2e0..0d6fa6c 100644
--- a/keymaster/4.0/vts/OWNERS
+++ b/keymaster/4.0/vts/OWNERS
@@ -1,3 +1,4 @@
+drysdale@google.com
 jbires@google.com
 jdanis@google.com
 swillden@google.com