Add owners for the security HALs

Test: n/a
Change-Id: Ie5e4856bd80e901262fe53a9edd5d7d70d1e77b4
diff --git a/security/OWNERS b/security/OWNERS
index fbaf854..619139b 100644
--- a/security/OWNERS
+++ b/security/OWNERS
@@ -6,9 +6,11 @@
 #
 # This will get them auto-assigned to the on-call triage engineer, ensuring quickest response.
 
+ascull@google.com
 drysdale@google.com
 eranm@google.com
 hasinitg@google.com
 jbires@google.com
+sethmo@google.com
 swillden@google.com
 zeuthen@google.com