dt-bindings: Drop type from 'cpus' property

'cpus' is a common property, and it is now defined in dtschema schemas,
so drop the type references in the tree.

Acked-by: Suzuki K Poulose <suzuki.poulse@arm.com>
Acked-by: Bjorn Andersson <andersson@kernel.org>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20221111212857.4104308-1-robh@kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/interrupt-controller/apple,aic.yaml

@@ -90,7 +90,6 @@ properties:
             maximum: 5
 
           cpus:
-            $ref: /schemas/types.yaml#/definitions/phandle-array
             description:
               Should be a list of phandles to CPU nodes (as described in
               Documentation/devicetree/bindings/arm/cpus.yaml).