Split the SDL GPIO emulator driver in a top and bottom
to enable using it with embedded libCs.
Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>
This commit adds a driver to simulate GPIO state and interrupts
using the keyboard when using SDL.
Signed-off-by: Pieter De Gendt <pieter.degendt@basalte.be>