dt-bindings: serial: renesas,sci: Document RZ/G2UL SoC

Add SCI binding documentation for Renesas RZ/G2UL SoC. No driver changes
are required as generic compatible string "renesas,sci" will be used as
a fallback.

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Link: https://lore.kernel.org/r/20220207142213.19552-3-biju.das.jz@bp.renesas.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/serial/renesas,sci.yaml

@@ -17,6 +17,7 @@ properties:
     oneOf:
       - items:
           - enum:
+              - renesas,r9a07g043-sci     # RZ/G2UL
               - renesas,r9a07g044-sci     # RZ/G2{L,LC}
               - renesas,r9a07g054-sci     # RZ/V2L
           - const: renesas,sci            # generic SCI compatible UART
@@ -67,6 +68,7 @@ if:
     compatible:
       contains:
         enum:
+          - renesas,r9a07g043-sci
           - renesas,r9a07g044-sci
           - renesas,r9a07g054-sci
 then: