sched: fair: Add placement snapshot

This snapshot is taken from msm-4.9 as of commit 935c3e96d14c14d
(Revert "sched/fair: Limit sync wakeup bias to waker cpu").

Change-Id: I3d123655edb5c6d9de647996930327e65d8cdc19
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>
[satyap@codeaurora.org: Resolve merge conflicts]
Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>