MAINTAINERS: Add miscdevice.h to file list for char/misc drivers.

Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

MAINTAINERS

@@ -2146,6 +2146,7 @@ T:	git git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git
 S:	Supported
 F:	drivers/char/*
 F:	drivers/misc/*
+F:	include/linux/miscdevice.h
 
 CHECKPATCH
 M:	Andy Whitcroft <apw@canonical.com>