Per fsl-imx-gpio.yaml, 'ngpios' is not a valid property.

Remove it to fix the following schema warning:

imx8qm-apalis-v1.1-ixora-v1.2.dtb: gpio@5d0d0000: 'ngpios' does not match any of the regexes: '^(hog-[0-9]+|.+-hog(-[0-9]+)?)$', 'pinctrl-[0-9]+'
	from schema $id: http://devicetree.org/schemas/gpio/fsl-imx-gpio.yaml#Signed-off-by: Fabio Estevam <festevam@denx.de>
Reviewed-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>