dt-bindings: pwm: renesas,tpu-pwm: Improve json-schema

- Include the general PWM controller schema,
- Make clocks, power-domains, and resets properties required.

Signed-off-by: Geert Uytterhoeven <[e-mail]>
Acked-by: Yoshinori Sato <[e-mail]>
Link: https://lore.kernel.org/r/d36e3[e-mail]
Signed-off-by: Rob Herring <[e-mail]>

Documentation/devicetree/bindings/pwm/renesas,tpu-pwm.yaml

···
   - compatible
   - reg
   - '#pwm-cells'
+  - clocks
+  - power-domains
+
+allOf:
+  - $ref: pwm.yaml#
+
+  - if:
+      not:
+        properties:
+          compatible:
+            contains:
+              enum:
+                - renesas,tpu-r8a73a4
+                - renesas,tpu-r8a7740
+    then:
+      required:
+        - resets
 
 additionalProperties: false