Revert "msm: thermal: Keep core_control_mask coincident with boot_cpu_mask"

This reverts commit 2a5f5ed0.

This change breaks the thermal hotplug logic.

Change-Id: I93632f934c89381e6fbc1c6ad0deb7d032d234b9
Signed-off-by: Ram Chandrasekar <rkumbako@codeaurora.org>