rcu: Add lockdep_assert_irqs_disabled() to rcu_exp_need_qs()

Callers to rcu_exp_need_qs() are supposed to disable interrupts, so this
commit enlists lockdep's aid in checking this.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Cc: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>