Update rt2x00 MAINTAINERS entry

Add the tree entry for rt2x00 to inform people about the
rt2x00.git tree.

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

MAINTAINERS

@@ -3280,6 +3280,7 @@ L:	linux-wireless@vger.kernel.org
 L:	rt2400-devel@lists.sourceforge.net
 W:	http://rt2x00.serialmonkey.com/
 S:	Maintained
+T:	git kernel.org:/pub/scm/linux/kernel/git/ivd/rt2x00.git
 F:	drivers/net/wireless/rt2x00/
 
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