This makes it easier to blanket never reset flash and USB pins. It
also allows us to set a custom state after reset. The first case
is for the double tap reset that needs to be pulled low.
Fixes#5893
This tweaks the RMT timing to better match the 1/3 and 2/3 of 800khz
guideline for timing. It also ensures a delay of 300 microseconds
with the line low before reset.
Pin reset is now changed to the IDF default which pulls the pin up
rather than CircuitPython's old behavior of floating the pin.
Fixes#5679
