sched/fair: Depend on sched_asym_cpucapacity for new ilb

We have made the new idle CPU selection for load balance energy
aware. For example, if a silver CPU does not have any misfit
tasks but is overloaded, we have to select a silver CPU not
gold CPU. However, this extra checks are needed only when the
system has asymmetric capacity CPUs. So we should depend on
sched_asym_cpucapacity feature instead of sched_energy_present.
Later patches enable sched_energy_present for SMP systems also.

Change-Id: Ie4fae9d1c17511f15b48b92dd61395d1689e1612
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>