Update gpio resmgr to support RPi5.
Update rpi_gpio resmgr to add RPi5 support:
- moved code around to be able to support both RPi4 and RPi5
- added code to autodetect which platform running on (rpi4, rpi5)
- also added new command-line option to explicitly specify which platform running on.
QNXE-857 Support GPIOs for RPI5 in rpi-gpio