feat(neoverse_rd): deprecate and remove SGI-575 platform

deprecate and remove support for SGI-575 platform.

Signed-off-by: Rohit Mathew <rohit.mathew@arm.com>
Change-Id: Iffee2fa8f4faa463c4b4df591182f72a461c880b
diff --git a/docs/about/maintainers.rst b/docs/about/maintainers.rst
index 3e33824..17d414b 100644
--- a/docs/about/maintainers.rst
+++ b/docs/about/maintainers.rst
@@ -591,7 +591,6 @@
 :|F|: plat/arm/board/neoverse_rd/platform/rdn2/
 :|F|: plat/arm/board/neoverse_rd/platform/rdv1/
 :|F|: plat/arm/board/neoverse_rd/platform/rdv1mc/
-:|F|: plat/arm/board/neoverse_rd/platform/sgi575/
 
 Arm Total Compute platform port
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
diff --git a/docs/plat/index.rst b/docs/plat/index.rst
index 768a437..715b488 100644
--- a/docs/plat/index.rst
+++ b/docs/plat/index.rst
@@ -65,7 +65,6 @@
 
    - Arm Neoverse N1 System Development Platform (N1SDP)
    - Arm Neoverse Reference Design N1 Edge (RD-N1-Edge) FVP
-   - Arm SGI-575
    - MediaTek MT8173 SoCs
 
 Deprecated platforms
@@ -80,6 +79,9 @@
 |     fvp_r      |      Arm       |        2.13        |         2.13       |
 |                |                |                    |                    |
 +----------------+----------------+--------------------+--------------------+
+|    SGI-575     |      Arm       |        2.13        |         2.13       |
+|                |                |                    |                    |
++----------------+----------------+--------------------+--------------------+
 
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