Updated TTY MAINTAINERS info

Greg Kroah-Hartman is the current TTY maintainer, however he wouldn't appear
listed as such upon running get_maintainers.pl for drivers under
drivers/tty/serial.
Signed-off-by: Lucas Kannebley Tavares <lucaskt@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

MAINTAINERS

@@ -6664,7 +6664,7 @@ TTY LAYER
 M:	Greg Kroah-Hartman <gregkh@suse.de>
 S:	Maintained
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty-2.6.git
-F:	drivers/tty/*
+F:	drivers/tty/
 F:	drivers/tty/serial/serial_core.c
 F:	include/linux/serial_core.h
 F:	include/linux/serial.h