arm: add initial support for Amlogic P212 based on Meson GXL family

This adds platform code for the Amlogic P212 reference board based on a
Meson GXL (S905X) SoC with the Meson GXL configuration.

This initial submission only supports UART and MMC/SDCard, support for the
internal Ethernet PHY in Work In Progress.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Beniamino Galvani <b.galvani@gmail.com>
diff --git a/board/amlogic/p212/MAINTAINERS b/board/amlogic/p212/MAINTAINERS
new file mode 100644
index 0000000..6575f17
--- /dev/null
+++ b/board/amlogic/p212/MAINTAINERS
@@ -0,0 +1,6 @@
+P212
+M:	Neil Armstrong <narmstrong@baylibre.com>
+S:	Maintained
+F:	board/amlogic/p212/
+F:	include/configs/p212.h
+F:	configs/p212_defconfig