rcutorture: Add RCU-tasks tests to default rcutorture list

Although the test cases have been added, they must be specified explicitly
via the kvm.sh --configs argument in order to run them.  This commit
therefore adds the RCU-tasks tests to the CFLIST so that they will be
run automatically by default.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

tools/testing/selftests/rcutorture/configs/rcu/CFLIST

@@ -11,3 +11,6 @@ SRCU-N
 SRCU-P
 TINY01
 TINY02
+TASKS01
+TASKS02
+TASKS03