board: amlogic: add mailing-list to MAINTAINERS

Add missing mailing-list to the amlogic boards MAINTAINERS file.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
diff --git a/board/amlogic/p200/MAINTAINERS b/board/amlogic/p200/MAINTAINERS
index 96fe92d..c20f056 100644
--- a/board/amlogic/p200/MAINTAINERS
+++ b/board/amlogic/p200/MAINTAINERS
@@ -2,6 +2,7 @@
 M:	Beniamino Galvani <b.galvani@gmail.com>
 M:	Neil Armstrong <narmstrong@baylibre.com>
 S:	Maintained
+L:	u-boot-amlogic@groups.io
 F:	board/amlogic/p200/
 F:	configs/nanopi-k2_defconfig
 F:	configs/odroid-c2_defconfig