Summary:
- Add Raspberry Pi Pico (RP2040) USB device controller support.
- Confirmed that CDC/ACM, MSC and these composite device are working.
- The current implementation have an unresolved issue and some workaround
for USB MSC SCSI driver is required.
See the comment in the patch "usbmsc: Add USBMSC_NOT_STALL_BULKEP for RP2040 workaround".
Impact:
- RP2040 only
Testing:
- Tested with Windows 10 and Ubuntu-18.04/20.04 as the USB host.
- Tested configurations:
- raspberrypi-pico:usbnsh
- raspberrypi-pico:usbmsc
- raspberrypi-pico:composite
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