dt-bindings: timer: ingenic,tcu: use absolute path to other schema

Absolute path to other DT schema is preferred over relative one.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Paul Cercueil <paul@crapouillou.net>
Link: https://lore.kernel.org/r/20220726115937.101432-1-krzysztof.kozlowski@linaro.orgSigned-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

Documentation/devicetree/bindings/timer/ingenic,tcu.yaml

@@ -113,7 +113,7 @@ properties:
 patternProperties:
   "^watchdog@[a-f0-9]+$":
     type: object
-    $ref: ../watchdog/watchdog.yaml#
+    $ref: /schemas/watchdog/watchdog.yaml#
     properties:
       compatible:
         oneOf:
@@ -145,7 +145,7 @@ patternProperties:
 
   "^pwm@[a-f0-9]+$":
     type: object
-    $ref: ../pwm/pwm.yaml#
+    $ref: /schemas/pwm/pwm.yaml#
     properties:
       compatible:
         oneOf: