Add gameport.h, serio.h and uinput.h and complementing them headers
from include/uapi/ to "INPUT (KEYBOARD, MOUSE, JOYSTICK, TOUCHSCREEN)
DRIVERS" section so that get_maintainers.pl script will pick them up
and patches affecting them will be sent to the right place.
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>