sched: fair: Work in isolation conditions into SMP placement path

This snapshot is taken from msm-4.9 as of commit a81181397b9229d
(Merge "msm: vidc: add P010 color format in govenors").

Change-Id: Ifc22b1295d4d89c219f3b2cb7a238ef31865301d
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>
[satyap@codeaurora.org: Port to 4.19 and fix merge conflicts]
Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>