doc: renesas: Document platforms based on RZ/G2 SoC's

Document the platforms based on RZ/G2 SoC's.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Change-Id: I9ce5b9df3573b1198c5c7be79b5471d54573609a
diff --git a/docs/about/maintainers.rst b/docs/about/maintainers.rst
index 91a5621..5ac1730 100644
--- a/docs/about/maintainers.rst
+++ b/docs/about/maintainers.rst
@@ -486,6 +486,17 @@
 :F: drivers/renesas/rcar
 :F: tools/renesas/rcar_layout_create
 
+Renesas RZ/G2 platform port
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+:M: Biju Das <biju.das.jz@bp.renesas.com>
+:G: `bijucdas`_
+:F: docs/plat/rz-g2.rst
+:F: plat/renesas/common
+:F: plat/renesas/rzg
+:F: drivers/renesas/common
+:F: drivers/renesas/rzg
+:F: tools/renesas/rzg_layout_create
+
 RockChip platform port
 ^^^^^^^^^^^^^^^^^^^^^^
 :M: Tony Xie <tony.xie@rock-chips.com>
@@ -601,6 +612,7 @@
 .. _AlexeiFedorov: https://github.com/AlexeiFedorov
 .. _Andre-ARM: https://github.com/Andre-ARM
 .. _Anson-Huang: https://github.com/Anson-Huang
+.. _bijucdas: https://github.com/bijucdas
 .. _bryanodonoghue: https://github.com/bryanodonoghue
 .. _b49020: https://github.com/b49020
 .. _carlocaione: https://github.com/carlocaione