usb_cdc: add support for bootloader requests over USB CDC

Klipper3d / klipper

Klipper is a 3d-printer firmware

GNU General Public License v3.0

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Closed Laikulo closed 1 year ago

Laikulo commented 1 year ago

This adds support for the "Request Serial Bootloader" psuedo-command to the virtual serial device.

Laikulo commented 1 year ago

Retracting in favor of existing 1200/DTR functionality