dt-bindings/thermal: Add property to selectively register CPU cooling devs

CPU cooling device register and handling max and min limit
functionalities are moved to cpu clock driver and cpu vdd min
voltage cooling device driver respectively. Add optional property
to selectively register CPU cooling devices for LMH DCVSh driver.

Change-Id: I0dea34a3c7f3904aaf06193a01d94f49569ecadc

bindings/thermal/qcom-lmh-dcvs.txt

@@ -57,6 +57,12 @@ Properties:
 			register space in index 0 should be LLM and index 1
 			should be OSM.
 
+- qcom,no-cooling-device-register:
+	Usage: optional
+	Value type: <none>
+	Definition: Should define this property if this driver doesn't need
+			to register CPU cooling devices with thermal framework.
+
 Example:
 
 	lmh_dcvs0: qcom,limits-dcvs@18350800 {