This allows a board to modify initial_r0 if needed.
Also make default board behaviour functions always available, named as
mboot_get_reset_mode_default and mboot_state_change_default.
Signed-off-by: Damien George <damien@micropython.org>
Add basic support for LEGO HUB NO.6 (e.g. LEGO SPIKE Prime, LEGO MINDSTORMS
Robot Inventor).
See README.md for details.
Thanks to @dpgeorge for helping put this together.
Signed-off-by: Tobias Thyrrestrup <tt@LEGO.com>