Revert "sched: revert force load balance when silver has big tasks"

It seems 3D Mark regressed with the change.
This reverts commit c7bad7458b86e98e65888a3462e23f14b8710b62

Change-Id: Ie304f84fde7d591f54dac5c401d7881adf506236
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
Signed-off-by: Pawan Chilka <pchilka@codeaurora.org>