ARM: dts: msm: Add msm-thermal mitigation device for MSM Samarium

Add kernel msm-thermal mitigation device for MSM Samarium SoC.
This enables the Kernel Thermal Monitor(KTM) during boot-up,
which provides basic thermal mitigation. The KTM is enabled
till the userspace thermal mitigation takes over.

Change-Id: I0ce041d3ddde8d75a3a46084ecbc908a40a3847b
Signed-off-by: Anji Jonnala <anjir@codeaurora.org>