tty: the development tree is now done in git

So properly mark it as such in the MAINTAINERS file.
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

MAINTAINERS

@@ -161,7 +161,7 @@ M:	Greg Kroah-Hartman <gregkh@suse.de>
 L:	linux-serial@vger.kernel.org
 W:	http://serial.sourceforge.net
 S:	Maintained
-T:	quilt kernel.org/pub/linux/kernel/people/gregkh/gregkh-2.6/
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty-2.6.git
 F:	drivers/serial/8250*
 F:	include/linux/serial_8250.h
 
@@ -5910,7 +5910,7 @@ S:	Maintained
 TTY LAYER
 M:	Greg Kroah-Hartman <gregkh@suse.de>
 S:	Maintained
-T:	quilt kernel.org/pub/linux/kernel/people/gregkh/gregkh-2.6/
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty-2.6.git
 F:	drivers/char/tty_*
 F:	drivers/serial/serial_core.c
 F:	include/linux/serial_core.h