Add rp2040 pio usb host

[hathach]

Add support for rp2040 with pico-pio-usb as bit-banging host controller. work more as proof of concept, API for host is WIP and can be changed in the future. The example can be found at

• https://github.com/adafruit/Adafruit_TinyUSB_Arduino/blob/rp2040-pio-usb-host/examples/DualRole/device_info_rp2040/device_info_rp2040.ino

requires

• https://github.com/sekigon-gonnoc/Pico-PIO-USB/pull/34
• https://github.com/sekigon-gonnoc/Pico-PIO-USB/pull/35
• https://github.com/earlephilhower/arduino-pico/pull/628

Note: ci failed since Pico-PIO-USB isn't index by arduino library just yet to build, will take a couple of days to sort this out.