dt-bindings: display: arm,pl11x: Allow resets property

Allow resets property to fix below CHECK_DTB warning:
  arch/arm/boot/dts/nxp/lpc/lpc4337-ciaa.dtb: lcd-controller@40008000 (arm,pl111): 'resets' does not match any of the regexes: 'pinctrl-[0-9]+'

Signed-off-by: Frank Li <Frank.Li@nxp.com>
Link: https://lore.kernel.org/r/20250602144906.944866-1-Frank.Li@nxp.com
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>

Author: nxpfrankli

Documentation/devicetree/bindings/display/arm,pl11x.yaml

@@ -78,6 +78,9 @@ properties:
       If not present, the memory interface is fast enough to handle all
       possible video modes.
 
+  resets:
+    maxItems: 1
+
   port:
     $ref: /schemas/graph.yaml#/$defs/port-base
     additionalProperties: false