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/p212/MAINTAINERS b/board/amlogic/p212/MAINTAINERS
index 74ad371..8848df0 100644
--- a/board/amlogic/p212/MAINTAINERS
+++ b/board/amlogic/p212/MAINTAINERS
@@ -1,6 +1,7 @@
 P212
 M:	Neil Armstrong <narmstrong@baylibre.com>
 S:	Maintained
+L:	u-boot-amlogic@groups.io
 F:	board/amlogic/p212/
 F:	include/configs/p212.h
 F:	configs/khadas-vim_defconfig