MAINTAINERS: make linux-usb list remarks consistent

Commit f24f27b8 ("MAINTAINERS: add entry for mediatek usb3 DRD IP
driver") claims linux-usb@vger.kernel.org is moderated for
non-subscribers, but all other 46 entries for linux-usb@vger.kernel.org
do not mention that.

Adjust this entry to be consistent with all others.
Signed-off-by: NLukas Bulwahn <lukas.bulwahn@gmail.com>
Link: https://lore.kernel.org/r/20200912121346.2796-1-lukas.bulwahn@gmail.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

MAINTAINERS

@@ -11049,7 +11049,7 @@ F:	net/dsa/tag_mtk.c
 
 MEDIATEK USB3 DRD IP DRIVER
 M:	Chunfeng Yun <chunfeng.yun@mediatek.com>
-L:	linux-usb@vger.kernel.org (moderated for non-subscribers)
+L:	linux-usb@vger.kernel.org
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 L:	linux-mediatek@lists.infradead.org (moderated for non-subscribers)
 S:	Maintained