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

Add SCIF binding documentation for Renesas RZ/G2UL SoC. SCIF block on
RZ/G2UL is identical to one found on the RZ/G2L SoC. No driver changes
are required as RZ/G2L compatible string "renesas,scif-r9a07g044" will
be used as a fallback.

Whilst dropped the comments after RZ/G2{L,LC} fallback as to
avoid updating the comment over and over again when a new IP
is added
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/20220207142213.19552-2-biju.das.jz@bp.renesas.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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

@@ -76,8 +76,9 @@ properties:
 
       - items:
           - enum:
+              - renesas,scif-r9a07g043      # RZ/G2UL
               - renesas,scif-r9a07g054      # RZ/V2L
-          - const: renesas,scif-r9a07g044   # RZ/G2{L,LC} fallback for RZ/V2L
+          - const: renesas,scif-r9a07g044   # RZ/G2{L,LC} fallback
 
   reg:
     maxItems: 1