rcutorture: Make rcu_torture_write_types() print number of update types

rcutorture: Make rcu_torture_write_types() print number of update types

This commit follows the list of update types with their count, resulting
in console output like this:

	rcu_torture_write_types: Testing conditional GPs.
	rcu_torture_write_types: Testing conditional expedited GPs.
	rcu_torture_write_types: Testing conditional full-state GPs.
	rcu_torture_write_types: Testing expedited GPs.
	rcu_torture_write_types: Testing asynchronous GPs.
	rcu_torture_write_types: Testing polling GPs.
	rcu_torture_write_types: Testing polling full-state GPs.
	rcu_torture_write_types: Testing polling expedited GPs.
	rcu_torture_write_types: Testing polling full-state expedited GPs.
	rcu_torture_write_types: Testing normal GPs.
	rcu_torture_write_types: Testing 10 update types

This commit adds the final line giving the count.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Neeraj Upadhyay <neeraj.upadhyay@kernel.org>