ARM: dts: msm: Update CX thermal zone thresholds for SA6155 and SA6155P

Update CX mitigation related thermal zone thresholds for SA6155 and
SA6155P targets based on latest recommendation.

Change-Id: Id3b070f546900d76dc70e60552f2d176e4345e59
Signed-off-by: Manaf Meethalavalappu Pallikunhi <manafm@codeaurora.org>