ARM: dts: msm: Add case_therm sensor to thermal sensor info node

Add case_therm sensor which is enabled in some variant of msm8909
to thermal sensor info node to enable thermal sensor info client to
dynamically read this sensor for msm8909.

Change-Id: I1c3adbe06cb2d719715ca3bb3ae0667ca029fad0
Signed-off-by: Manaf Meethalavalappu Pallikunhi <manafm@codeaurora.org>