sched/topology: Enable EAS on SMP systems also

Currently EAS gets disabled when the system has only symmetric CPUs.
For example, either the system is SMP or all big or little CPUs are
hotplugged out on a b.L system. EAS features are required for better
power and performance on systems with symmetric CPUs. So don't disable
EAS on symmetric systems. This is done by assigning sd_asym_cpucapacity
per-cpu pointer to the only available sched domain.

Change-Id: If08a162f652a6a73884481ebc60e940373dbf9e2
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>