sched/fair: Remove EAS enforcement in find_best_target()

commit 63c27502 ("sched: fair: Always try to use energy
efficient cpu for wakeups") forces energy aware task placement
for all tasks. So there is no need to have any additional
checks in find_best_target() to enforce EAS mode.

Change-Id: I001326afcd14b221dbbc545b82d4f9204bf7417d
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>