rcu: Move rcu_needs_cpu() to tree.c
Now that RCU_FAST_NO_HZ is no more, there is but one implementation of
the rcu_needs_cpu() function. This commit therefore moves this function
from kernel/rcu/tree_plugin.c to kernel/rcu/tree.c.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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