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dcd_event_handler() is called from the IRQ when a new DCD event is queued
for processing by the TinyUSB thread mode task.  This lets us queue the
handler to run immediately when MicroPython resumes.

Currently this relies on a linker --wrap hack to work, but a PR has been
submitted to TinyUSB to allow the function to be called inline from
dcd_event_handler() itself.

This work was funded through GitHub Sponsors.
Signed-off-by: Angus Gratton <angus@redyak.com.au>