ARM: dts: msm: Use thermal state macro to specify state for SDM845

Use thermal cooling device mitigation state macro THERMAL_MAX_LIMIT
macro to specify the mitigation state for SDM845.

Change-Id: I1a94614bb96b2717bbda1661502176d04a2d6a14
Signed-off-by: Ram Chandrasekar <rkumbako@codeaurora.org>