board: amlogic: move khadas-vim2 as q200 ref board

The Khadas vim2 derive from amlogic s912 reference design (Q200).

This patch moves the khadas-vim2 board support to a generic Q200 board,
while keeping a dedicated defconfig to customize the names and device tree.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
diff --git a/board/amlogic/q200/MAINTAINERS b/board/amlogic/q200/MAINTAINERS
new file mode 100644
index 0000000..be86386
--- /dev/null
+++ b/board/amlogic/q200/MAINTAINERS
@@ -0,0 +1,6 @@
+Q200
+M:	Neil Armstrong <narmstrong@baylibre.com>
+S:	Maintained
+F:	board/amlogic/q200/
+F:	include/configs/q200.h
+F:	configs/khadas-vim2_defconfig