platform: Added deprecation warnings for sse-200_aws

This patch modifies the cmake configuration
for sse-200_aws to display the deprecation warning at build-time.

It also adds a LOG_MESSAGE entry on the spm_hal which
displays a run-time notification.

The Deprecated Platforms section of the documentation is
updated to reflect this status change.

Signed-off-by: Minos Galanakis <minos.galanakis@arm.com>
Change-Id: I3b29fd02a29ecb89d0eec241211a281356f51198
diff --git a/docs/contributing/platform_deprecation.rst b/docs/contributing/platform_deprecation.rst
index d9d00ff..52fca23 100644
--- a/docs/contributing/platform_deprecation.rst
+++ b/docs/contributing/platform_deprecation.rst
@@ -56,7 +56,9 @@
 +==============================+===========+===================================+
 |    mps2/an539                | v1.2.0    |   N.A                             |
 +------------------------------+-----------+-----------------------------------+
+|    mps2/sse-200_aws          | v1.3.0    |   N.A                             |
++------------------------------+-----------+-----------------------------------+
 
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-*Copyright (c) 2020, Arm Limited. All rights reserved.*
+*Copyright (c) 2020-2021, Arm Limited. All rights reserved.*