dt-bindings: display: bridge: tc358867: Add interrupt property

This bridge has an interrupt line for event signaling. Add the
corresponding property.

Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230718084411.1189831-1-alexander.stein@ew.tq-group.com

Documentation/devicetree/bindings/display/bridge/toshiba,tc358767.yaml

@@ -49,6 +49,9 @@ properties:
     description: |
         OF device-tree gpio specification for RSTX pin(active low system reset)
 
+  interrupts:
+    maxItems: 1
+
   toshiba,hpd-pin:
     $ref: /schemas/types.yaml#/definitions/uint32
     enum: