drivers: udc: add UDC driver for RP2040 USB device controller

This driver is mostly rewritten from scratch, with some parts borrowed
from the usb_dc_rpi_pico driver implemented by Pete Johanson.
This driver does not use any function from RPI PICO HAL and actually
could be furter improved to not use any defines or types from the HAL as
they are confusing and overdo it with volatile qualifiers.

Signed-off-by: Johann Fischer <johann.fischer@nordicsemi.no>