Hello, I believe, you don't need.
ssl vpn configuraiotn on router usually enables both clientless vpn (portal) and client (AnyConnect) access.
You can also specify to use only AnyConnect access by using:
functions svc-enabled|svc-required
in the configuration of ssl vpn policy group.
For more information, please, visit:
http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/sec_conn_sslvpn/configuration/15-mt/sec-conn-sslvpn-15-mt-book.html