ANDROID: sched/fair: Avoid unnecessary balancing of asymmetric capacity groups

On systems with asymmetric cpu capacities, a skewed load distribution
might yield better throughput than balancing load per group capacity.
For example, running compute intensive tasks on high capacity cpus while
leaving low capacity cpus idle. So we let load-balance back off if the
busiest group isn't really overloaded.

cc: Ingo Molnar <mingo@redhat.com>
cc: Peter Zijlstra <peterz@infradead.org>

Signed-off-by: Morten Rasmussen <morten.rasmussen@arm.com>
Change-Id: I8b08a0fa73f357a9972324bc76cec3912fe293cf
Signed-off-by: Chris Redpath <chris.redpath@arm.com>