Modify ep-engine target in toy-sriram.xml

Change-Id: I224168efe6fe857087f20c74c0a6beea9e1b7af5
Reviewed-on: http://review.couchbase.org/40988
Reviewed-by: Sriram Ganesan <sriram@couchbase.com>
Tested-by: Sriram Ganesan <sriram@couchbase.com>