ARM: dts: qcom: Add thermal tsens node support for mdm9607

Add device tree register Property "tsens_srot_physical", to
identify the right srot register.
Also rename the register "tsens_tm_physical" to
align with the  current thermal core naming convention.

Add "thermal-sensor-cells" device tree property to support
sensor cells.

Change-Id: I2d80796b106c86c6a97f35a162da33ca809ff512
Signed-off-by: Sagar Chormale <schormal@codeaurora.org>