feat(ast2700): add Aspeed AST2700 platform support

Aspeed AST2700 is a quad-core SoC with ARM Cortex-A35 integrated.
This patch adds the initial platform support for AST2700 and also
updates the documents.

Change-Id: I1796f7aae5ed2d1799e91fabb8949607959cd9b3
Signed-off-by: Chia-Wei Wang <chiawei_wang@aspeedtech.com>
diff --git a/docs/about/maintainers.rst b/docs/about/maintainers.rst
index b591f2a..663859f 100644
--- a/docs/about/maintainers.rst
+++ b/docs/about/maintainers.rst
@@ -527,6 +527,15 @@
 :|G|: `rupsin01`_
 :|F|: plat/arm/board/tc
 
+Aspeed platform port
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+:|M|: Chia-Wei Wang <chiawei_wang@aspeedtech.com>
+:|G|: `ChiaweiW`_
+:|M|: Neal Liu <neal_liu@aspeedtech.com>
+:|G|: `Neal-liu`_
+:|F|: docs/plat/ast2700.rst
+:|F|: plat/aspeed/
+
 HiSilicon HiKey and HiKey960 platform ports
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 :|M|: Haojian Zhuang <haojian.zhuang@linaro.org>
@@ -983,3 +992,5 @@
 .. _bytefire: https://github.com/bytefire
 .. _rupsin01: https://github.com/rupsin01
 .. _jimmy-brisson: https://github.com/theotherjimmy
+.. _ChiaweiW: https://github.com/chiaweiw
+.. _Neal-liu: https://github.com/neal-liu