ARM: dts: msm: Add thermal node for fsm9900 targets

Added a thermal node in the device tree to support tsens
thermal monitoring for the FSM9900 targets.

Change-Id: I412cbcec403c94b842c1cafbcbbb9943c57a4588
Acked-by: Kaushik Sikdar <ksikdar@qti.qualcomm.com>
Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org>