sched/fair: add tunable to force selection at cpu granularity

sched/fair: add tunable to force selection at cpu granularity

EAS assumes that clusters with smaller capacity cores are more
energy-efficient. This may not be true on non-big-little devices,
so EAS can make incorrect cluster selections when finding a CPU
to wake. The "sched_is_big_little" hint can be used to cause a
cpu-based selection instead of cluster-based selection.

This change incorporates the addition of the sync hint enable patch

EAS did not honour synchronous wakeup hints, a new sysctl is
created to ask EAS to use this information when selecting a CPU.
The control is called "sched_sync_hint_enable".

Also contains:

EAS: sched/fair: for SMP bias toward idle core with capacity

For SMP devices, on wakeup bias towards idle cores that have capacity
vs busy devices that need a higher OPP

eas: favor idle cpus for boosted tasks

BUG: 29533997
BUG: 29512132
Change-Id: I0cc9a1b1b88fb52916f18bf2d25715bdc3634f9c
Signed-off-by: Juri Lelli <juri.lelli@arm.com>
Signed-off-by: Srinath Sridharan <srinathsr@google.com>
eas/sched/fair: Favoring busy cpus with low OPPs

BUG: 29533997
BUG: 29512132
Change-Id: I9305b3239698d64278db715a2e277ea0bb4ece79

Signed-off-by: Juri Lelli <juri.lelli@arm.com>