arm/dt: msm8226: Add core control support for msm_thermal

Specify core control limits (temperature, hysterisis and the allowed
cpus) to handle thermal conditions at boot and offline the cores when
thermal limits are crossed.

Change-Id: I302d2ea2f1eda7472574e1f4514f816aa2cfb2fc
Signed-off-by: Jennifer Liu <chihning@codeaurora.org>