docs(maintainers): add maintainers for AMD-Xilinx

Add following as maintainers for AMD Xilinx Platform ports
for TF-A Tests
- Michal Simek
- Amit Nagal
- Akshay Belsare

Signed-off-by: Akshay Belsare <akshay.belsare@amd.com>
Change-Id: I796fde094544c53d2fc6e6b6083b0687a152f276
diff --git a/docs/about/maintainers.rst b/docs/about/maintainers.rst
index 2d85f65..f7cf3de 100644
--- a/docs/about/maintainers.rst
+++ b/docs/about/maintainers.rst
@@ -22,4 +22,26 @@
 
 --------------
 
+Code owners
+-----------
+
+Platform Ports
+~~~~~~~~~~~~~~
+
+Xilinx platform port
+^^^^^^^^^^^^^^^^^^^^
+:|M|: Michal Simek <michal.simek@amd.com>
+:|G|: `michalsimek`_
+:|M|: Amit Nagal <amit.nagal@amd.com>
+:|G|: `amit-nagal`_
+:|M|: Akshay Belsare <akshay.belsare@amd.com>
+:|G|: `Akshay-Belsare`_
+:|F|: plat/xilinx\*
+:|F|: tftf/tests/plat/xilinx\*
+:|F|: docs/plat/xilinx-\*
+:|F|: tftf/tests/tests-versal.mk
+:|F|: tftf/tests/tests-versal.xml
+
+--------------
+
 *Copyright (c) 2018-2020, Arm Limited. All rights reserved.*