MAINTAINERS: remove kernel-discuss@handhelds.org list

kernel-discuss at handhelds.org is down for months, and nobody
knows why. So remove it for now.
Signed-off-by: NAnton Vorontsov <cbou@mail.ru>

MAINTAINERS

@@ -3053,7 +3053,6 @@ M:	cbou@mail.ru
 P:	David Woodhouse
 M:	dwmw2@infradead.org
 L:	linux-kernel@vger.kernel.org
-L:	kernel-discuss@handhelds.org
 T:	git git.infradead.org/battery-2.6.git
 S:	Maintained