Building with W=1 leads to the following dtc warning:

arch/arm/boot/dts/imx6ull-colibri.dtsi:36.9-46.5: Warning (graph_child_address): /connector/ports: graph node has single child node 'port@0', #address-cells/#size-cells are not necessary

Since a single port is used, 'ports' can be removed, as well as the
unnecessary #address-cells/#size-cells.

Fixes: bd5880e1 ("ARM: dts: colibri-imx6ull: Enable dual-role switching")
Signed-off-by: Fabio Estevam <festevam@denx.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>