PM: EM: Switch to rcu_dereference_all() in wakeup path

em_cpu_energy() is part of the EAS (Fair) task wakeup path. Now that
rcu_read_{,un}lock() have been removed from find_energy_efficient_cpu()
switch to rcu_dereference_all() and check for rcu_read_lock_any_held()
in em_cpu_energy() as well.
In EAS (Fair) task wakeup path is a preempt/IRQ disabled region, so
rcu_read_{,un}lock() can be removed.

Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: K Prateek Nayak <kprateek.nayak@amd.com>
Link: https://patch.msgid.link/5b1228b7-5949-4a45-9f62-e8ce936de694@arm.com

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