amlogic: g12a: Add support for the S905X2 (G12A) platform

Introduce the preliminary support for the Amlogic S905X2 (G12A) SoC.

This port is a minimal implementation of BL31 capable of booting
mainline U-Boot and Linux. Tested on a SEI510 board.

Signed-off-by: Carlo Caione <ccaione@baylibre.com>
Change-Id: Ife958f10e815a4530292c45446adb71239f3367f
diff --git a/docs/maintainers.rst b/docs/maintainers.rst
index 7731c72..d997baa 100644
--- a/docs/maintainers.rst
+++ b/docs/maintainers.rst
@@ -48,6 +48,14 @@
 :F: drivers/amlogic/gxl
 :F: plat/amlogic/gxl/
 
+Amlogic Meson S905X2 (G12A) platform port
+---------------------------------------
+:M: Carlo Caione <ccaione@baylibre.com>
+:G: `carlo.caione`_
+:F: docs/plat/meson-g12a.rst
+:F: drivers/amlogic/g12a
+:F: plat/amlogic/g12a/
+
 Armv7-A architecture port
 -------------------------
 :M: Etienne Carriere <etienne.carriere@linaro.org>