sched/fair: Only compute base_energy_pd if necessary

find_energy_efficient_cpu() searches the best energy CPU
to place a task on. To do so, the energy of each performance domain
(pd) is computed w/ and w/o the task placed on it.

The energy of a pd w/o the task (base_energy_pd) is computed prior
knowing whether a CPU is available in the pd.

Move the base_energy_pd computation after looping through the CPUs
of a pd and only compute it if at least one CPU is available.

Suggested-by: Xuewen Yan <[email protected]>
Signed-off-by: Pierre Gondois <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Reviewed-by: Lukasz Luba <[email protected]>
Reviewed-by: Dietmar Eggemann <[email protected]>
Reviewed-by: Vincent Donnefort <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

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