dt-bindings: power: renesas,rzg2l-sysc: Document RZ/G2UL SoC

Add DT binding documentation for SYSC controller found on RZ/G2UL SoC's.
SYSC controller found on the RZ/G2UL SoC is almost identical to one found
on the RZ/G2L SoC's only difference being that the RZ/G2UL has only CA55
core0 reset vector address configuration register.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220315142644.17660-2-biju.das.jz@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

Documentation/devicetree/bindings/power/renesas,rzg2l-sysc.yaml

@@ -10,8 +10,8 @@ maintainers:
   - Geert Uytterhoeven <geert+renesas@glider.be>
 
 description:
-  The RZ/{G2L,V2L} System Controller (SYSC) performs system control of the LSI
-  and supports following functions,
+  The RZ/{G2L,V2L}-alike System Controller (SYSC) performs system control of
+  the LSI and supports following functions,
   - External terminal state capture function
   - 34-bit address space access function
   - Low power consumption control
@@ -20,6 +20,7 @@ description:
 properties:
   compatible:
     enum:
+      - renesas,r9a07g043-sysc # RZ/G2UL
       - renesas,r9a07g044-sysc # RZ/G2{L,LC}
       - renesas,r9a07g054-sysc # RZ/V2L