arm64: dts: colibri-imx8x: fix iris pinctrl configuration

Remove GPIO3_IO10 from Iris carrier board pinctrl configuration,
this is already defined in the SOM dtsi since this is a
standard SOM functionality (wake-up button).

Duplicating it leads to the following error message
imx8qxp-pinctrl scu:pinctrl: pin IMX8QXP_QSPI0A_DATA1 already requested

Fixes: aefb5e2d ("arm64: dts: colibri-imx8x: Add iris carrier board")
Signed-off-by: Emanuele Ghidoli <emanuele.ghidoli@toradex.com>
Signed-off-by: Andrejs Cainikovs <andrejs.cainikovs@toradex.com>
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>