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dts: provide card detect GPIOs connected to uSDHC2

Patrick Wildt requested to merge bluerise/reform-system-image:bluerise-sd2-cd into main

On most i.MX-based systems, including the MNT Reform2, the SD2 card detect pin is routed to a GPIO instead of the uSDHC itself. The OS can only properly do card detect, if it is told that there is a GPIO to look at. This is also necessary for the MNT Reform2.

While the device tree currently does not specify any IOMUX config for this pin, the U-Boot built for this hardware already sets it up. It would make sense to add this pinctrl to the device tree as well.

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