MAINTAINERS: remove non-responding web link for atmel_usba driver

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Haavard Skinnemoen <hskinnemoen@gmail.com>
Cc: Hans-Christian Egtvedt <egtvedt@samfundet.no>

MAINTAINERS

@@ -1379,7 +1379,6 @@ F:	drivers/input/touchscreen/atmel_tsadcc.c
 ATMEL USBA UDC DRIVER
 M:	Nicolas Ferre <nicolas.ferre@atmel.com>
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
-W:	http://avr32linux.org/twiki/bin/view/Main/AtmelUsbDeviceDriver
 S:	Supported
 F:	drivers/usb/gadget/atmel_usba_udc.*