sched/fair: Add overutilization condition to sync wakeup case

Don't wake the sync wakee on the waker CPU if the CPU becomes
overutilized after adding the waking task load to its load.
Ideally the waker task load should be subtracted before checking
for the overutilization condition, but it is not done to cover the
cases where the wakee task continue to run after the sync wakeup.

CRs-Fixed: 2359706
Change-Id: Ic17cc79dca2cfb6bd2055aa6544464f1d6df6fcd
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
[adharmap@codeaurora.org: resolved minor merge conflicts]
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>