MAINTAINERS: add gameport.h, serio.h and uinput.h to INPUT section

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>

MAINTAINERS

@@ -10882,10 +10882,16 @@ F:	Documentation/devicetree/bindings/serio/
 F:	Documentation/input/
 F:	drivers/input/
 F:	include/dt-bindings/input/
+F:	include/linux/gameport.h
 F:	include/linux/input.h
 F:	include/linux/input/
+F:	include/linux/serio.h
+F:	include/linux/uinput.h
+F:	include/uapi/linux/gameport.h
 F:	include/uapi/linux/input-event-codes.h
 F:	include/uapi/linux/input.h
+F:	include/uapi/linux/serio.h
+F:	include/uapi/linux/uinput.h
 
 INPUT MULTITOUCH (MT) PROTOCOL
 M:	Henrik Rydberg <rydberg@bitmath.org>