dt-bindings: dsa: Remove unnecessary #address/#size-cells

dt-bindings: dsa: Remove unnecessary #address/#size-cells

If the example binding is used on a real dts file, the following DTC
warning is seen with W=1:

arch/arm/boot/dts/imx6q-b450v3.dtb: Warning (avoid_unnecessary_addr_size): /mdio-gpio/switch@0: unnecessary #address-cells/#size-cells without "ranges" or child "reg" property

Remove unnecessary #address-cells/#size-cells to improve the binding
document examples.

Signed-off-by: Fabio Estevam <[email protected]>
Reviewed-by: Rob Herring <[email protected]>
Reviewed-by: Florian Fainelli <[email protected]>
Signed-off-by: David S. Miller <[email protected]>