MAINTAINERS: add the missing linux alpha port mailling list

Signed-off-by: Cheng Renquan <crquan@gmail.com>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

MAINTAINERS

@@ -357,6 +357,7 @@ S:	Odd Fixes for 2.4; Maintained for 2.6.
 P:	Ivan Kokshaysky
 M:	ink@jurassic.park.msu.ru
 S:	Maintained for 2.4; PCI support for 2.6.
+L:	linux-alpha@vger.kernel.org
 
 AMD GEODE CS5536 USB DEVICE CONTROLLER DRIVER
 P:	Thomas Dahlmann