Merge changes from topic "amlogic/axg" into integration

* changes:
amlogic: axg: Add a build flag when using ATOS as BL32
amlogic: axg: Add support for the A113D (AXG) platform

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

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

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