dt-bindings: thermal: rcar-gen3-thermal: use positive logic

When handling the V3U/r8a779a0 exception, avoid using 'not:' because
then its subschemas are far away in the 'else:' branch. Keep them
together using positive logic.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20220610201701.7946-1-wsa+renesas@sang-engineering.comSigned-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

Documentation/devicetree/bindings/thermal/rcar-gen3-thermal.yaml

@@ -57,7 +57,6 @@ required:
   - "#thermal-sensor-cells"
 
 if:
-  not:
   properties:
     compatible:
       contains:
@@ -66,22 +65,22 @@ if:
 then:
   properties:
     reg:
-      minItems: 2
       items:
+        - description: TSC0 registers
         - description: TSC1 registers
         - description: TSC2 registers
         - description: TSC3 registers
-  required:
-    - interrupts
+        - description: TSC4 registers
 else:
   properties:
     reg:
+      minItems: 2
       items:
-        - description: TSC0 registers
         - description: TSC1 registers
         - description: TSC2 registers
         - description: TSC3 registers
-        - description: TSC4 registers
+  required:
+    - interrupts
 
 additionalProperties: false