rt2x00: update MAINTAINERS

Although I have always been the active maintainer of the rt2x00 drivers,
I was not mentioned explicitely in the MAINTAINERS file as such.

Update the rt2x00 entry in the MAINTAINERS file to add my name and
email address.
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

MAINTAINERS

@@ -4280,6 +4280,7 @@ F:	drivers/video/aty/aty128fb.c
 
 RALINK RT2X00 WIRELESS LAN DRIVER
 P:	rt2x00 project
+M:	Ivo van Doorn <IvDoorn@gmail.com>
 L:	linux-wireless@vger.kernel.org
 L:	users@rt2x00.serialmonkey.com (moderated for non-subscribers)
 W:	http://rt2x00.serialmonkey.com/