Split the SDL input driver in a top and bottom
to enable using it with embedded libCs.
Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>
Convert the SDL driver to use the input subsystem. This is specifically
meant to emulate touchscreen drivers, so it's setup to send triplet of
x, y, touch for touch-on events and just touch off on touch off events.
Renamed the driver to input-sdl-touch since now we can also develop an
sdl driver for simulating key events.
Signed-off-by: Fabio Baltieri <fabiobaltieri@google.com>