Add increased TinyUSB support

This release adds more lines to boards.txt to extend support for Adafruit TinyUSB library and also adds DFU push functionality using 1200bps touch.

For testing with this branch of the TinyUSB library:
https://github.com/code-fiasco/Adafruit_TinyUSB_Arduino/tree/stm32-support-v2

Author: code-fiasco