amlogic: axg: Add support for the A113D (AXG) platform

Introduce the preliminary support for the Amlogic A113D (AXG) SoC.

This port is a minimal implementation of BL31 capable of booting
mainline U-Boot, Linux and chainloading BL32 (ATOS).

Tested on a A113D board.

Signed-off-by: Carlo Caione <ccaione@baylibre.com>
Change-Id: Ic4548fa2f7c48d61b485b2a6517ec36c53c20809
diff --git a/docs/about/maintainers.rst b/docs/about/maintainers.rst
index d9d7f84..802dafc 100644
--- a/docs/about/maintainers.rst
+++ b/docs/about/maintainers.rst
@@ -64,6 +64,14 @@
 :F: drivers/amlogic/g12a
 :F: plat/amlogic/g12a/
 
+Amlogic Meson A113D (AXG) platform port
+-----------------------------------------
+:M: Carlo Caione <ccaione@baylibre.com>
+:G: `carlocaione`_
+:F: docs/plat/meson-axg.rst
+:F: drivers/amlogic/axg
+:F: plat/amlogic/axg/
+
 Armv7-A architecture port
 -------------------------
 :M: Etienne Carriere <etienne.carriere@linaro.org>