rcu-tasks: RCU Tasks Trace grace-period kthread has implicit QS

Because the task driving the grace-period kthread is in quiescent state
throughout, this commit excludes it from the list of tasks from which
a quiescent state is needed.

This does mean that attaching a sleepable BPF program to function in
kernel/rcu/tasks.h is a bad idea, by the way.

Signed-off-by: Paul E. McKenney <[email protected]>
Cc: Neeraj Upadhyay <[email protected]>
Cc: Eric Dumazet <[email protected]>
Cc: Alexei Starovoitov <[email protected]>
Cc: Andrii Nakryiko <[email protected]>
Cc: Martin KaFai Lau <[email protected]>
Cc: KP Singh <[email protected]>

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