This allows board code to override the default pull up reset state.
It is useful for pins that are already externally connected, pulled
or otherwise used by the board.
Fixes#5931
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
Scott Shawcroft
microDev