ARM: dts: imx6qdl-skov-cpu fix typo interrupt

ARM: dts: imx6qdl-skov-cpu fix typo interrupt

Fix typo interrupt, which should be 'interrupts'. Fix below CHECK_DTBS
warnings.

arch/arm/boot/dts/nxp/imx/imx6dl-skov-revc-lt2.dtb: switch@0 (microchip,ksz8873): Unevaluated properties are not allowed ('interrupt', 'pinctrl-names' were unexpected)
        from schema $id: http://devicetree.org/schemas/net/dsa/microchip,ksz.yaml

Signed-off-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>