MAINTAINERS: adjust input-related patterns

Add pattens for input-related headers to MAINTAINERS file.
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

MAINTAINERS

@@ -3432,6 +3432,8 @@ Q:	http://patchwork.kernel.org/project/linux-input/list/
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input.git
 S:	Maintained
 F:	drivers/input/
+F:	include/linux/input.h
+F:	include/linux/input/
 
 INPUT MULTITOUCH (MT) PROTOCOL
 M:	Henrik Rydberg <rydberg@euromail.se>