dt-bindings: thermal: rockchip: Tighten grf requirements

Instead of having an optional rockchip,grf property, forbid using it on
platforms without registers in a GRF being needed for thermal monitoring
and make it mandatory on the platforms actually needing it.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Reviewed-by: Dragan Simic <dsimic@manjaro.org>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20250820-thermal-rockchip-grf-warning-v2-3-c7e2d35017b8@kernel.org
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

Documentation/devicetree/bindings/thermal/rockchip-thermal.yaml

@@ -119,6 +119,21 @@ required:
   - resets
 
 allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - rockchip,px30-tsadc
+              - rockchip,rk3366-tsadc
+              - rockchip,rk3399-tsadc
+              - rockchip,rk3568-tsadc
+    then:
+      required:
+        - rockchip,grf
+    else:
+      properties:
+        rockchip,grf: false
   - if:
       not:
         properties: