Add starting of downcall functions for control

Signed-off-by: Matt Ranostay <mranostay@gmail.com>
Added downcalls for lighting framework

Signed-off-by: Matt Ranostay <mranostay@gmail.com>
Renamed device tree overlay name in README

Signed-off-by: Matt Ranostay <mranostay@gmail.com>
Move lock at the top of the console_thread so we don't drop the prompt display

Signed-off-by: Matt Ranostay <mranostay@gmail.com>