msm_hotplug: remove the CPU offline function from suspend
I have tested and i see that cores are going down any way on screen OFF.
and it's seems that there is a RACE if hotplug turn cores off, and something
was still using the core, i see log about no logger affine to cpu#
and that is not good, as app/service can stuck and brake something.

Any way there is no need to do this in HotPlug. other cpu code
already putting all cores to sleep.
thx @dorimanx for his great work