Add BoringSSL maintainer to OWNERS.

In order to reduce update friction.

Test: n/a
Change-Id: Id4afa1ee476b601bcf32252697fb224d1acbd014
diff --git a/OWNERS b/OWNERS
index 1a1bcd9..2b77910 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,2 +1,3 @@
 # Bug component: 684135
 include platform/external/conscrypt:/OWNERS
+davidben@google.com