msm: thermal: Online only cores, which are hotplugged by KTM

On thermal hotplug clear event, online only cores which are offlined
by KTM. During a thermal hotplug event, KTM evaluates the thermal
hotplug status of the cpus and hotplugs or brings them up accordingly.
It impacts cases where some cores are not cold boot yet or those cores
are offlined due to non thermal reason.

Change-Id: Ib4073be13c28c444ff6d322432b4ed46e10b1f08
Signed-off-by: Manaf Meethalavalappu Pallikunhi <manafm@codeaurora.org>