Input: update MAINTAINERS to explicitly mention touchscreens

Signed-off-by: Robert P. J. Day <rpjday@mindspring.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

MAINTAINERS

@@ -1856,7 +1856,7 @@ W:	http://www.openib.org/
 T:	git kernel.org:/pub/scm/linux/kernel/git/roland/infiniband.git
 S:	Supported
 
-INPUT (KEYBOARD, MOUSE, JOYSTICK) DRIVERS
+INPUT (KEYBOARD, MOUSE, JOYSTICK, TOUCHSCREEN) DRIVERS
 P:	Dmitry Torokhov
 M:	dmitry.torokhov@gmail.com
 M:	dtor@mail.ru