ARM: dts: vf-colibri: apply the EXT_IO pin group

pinctrl_gpio_ext describes the three Colibri EXT_IO pins, but no node
references it, so the pin controller never applies it and the pads keep
whatever mux and bias they came up with. It is the only pin group in the
Vybrid Colibri device trees that is defined and never used.

The three pins are GPIOs on gpio2 and belong to no device, so hog the
group on that controller. Referencing it from &iomuxc would work too, but
the pin controller would then depend on one of its own children, which
fw_devlink reports as a dependency cycle.

Signed-off-by: Mehmet Fide <mehmet.fide@screeningeagle.com>
Signed-off-by: Frank Li <Frank.Li@nxp.com>

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