sched: Make energy_aware_wake_cpu() work for both SMP and big.LITTLE

In energy_aware_wake_cpu(), the CPU search is limited to the lowest
capacity CPU group/cluster which can fit the task. This does not
work well on a SMP system, since all CPUs have the same capacity.
Hence expand the search to all CPU groups/clusters for SMP.

Change-Id: Iaea5b907d584442c901f35980f0bbb3d8e70c630
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>