ARM: meson: Add Khadas VIM2 board support

This adds platform code for the Khadas VIM2 board based on a
Meson GXM (S912) SoC with the Meson GXM configuration.

This initial submission supports UART, MMC/SDCard and Ethernet.
USB is partially supported.

All the code is from Neil Armstrong! I just rebased the code, do
some cleanup and tested on my board.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Loic Devulder <ldevulder@suse.de>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
diff --git a/board/amlogic/khadas-vim2/MAINTAINERS b/board/amlogic/khadas-vim2/MAINTAINERS
new file mode 100644
index 0000000..ca63e31
--- /dev/null
+++ b/board/amlogic/khadas-vim2/MAINTAINERS
@@ -0,0 +1,6 @@
+KHADAS-VIM2
+M:	Neil Armstrong <narmstrong@baylibre.com>
+S:	Maintained
+F:	board/amlogic/khadas-vim2/
+F:	include/configs/khadas-vim2.h
+F:	configs/khadas-vim2_defconfig