Add the GPIO driver for the ADI Engineering RCC-VE and RCC-DFF/DFFv2.
This driver allows read the software reset switch state and control the status LEDs.
The GPIO pins have their direction (input/output) locked down to prevent possible short circuits.
Note that most people get a reset button that is a hardware reset. The software reset button is available on boards from Netgate.
Sponsored by: Rubicon Communications (Netgate)
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