mips: ath79: add AP121 reference board

This patch add board-level code and base DT for AP121.

Signed-off-by: Wills Wang <wills.wang@live.com>
[updated defconfig, enabled CONFIG_USE_PRIVATE_LIBGCC=y]
Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
diff --git a/board/qca/ap121/MAINTAINERS b/board/qca/ap121/MAINTAINERS
new file mode 100644
index 0000000..8b02988
--- /dev/null
+++ b/board/qca/ap121/MAINTAINERS
@@ -0,0 +1,6 @@
+AP121 BOARD
+M:	Wills Wang <wills.wang@live.com>
+S:	Maintained
+F:	board/qca/ap121/
+F:	include/configs/ap121.h
+F:	configs/ap121_defconfig