tools/rcu: Remove RCU Tasks Rude asynchronous APIs from rcu-updaters.sh

The call_rcu_tasks_rude() and rcu_barrier_tasks_rude() APIs are no longer.
This commit therefore removes them from the rcu-updaters.sh script.

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