spi: dt-bindings: renesas,rspi: Document RZ/V2L SoC

Add RSPI binding documentation for Renesas RZ/V2L SoC.

RSPI block is identical to one found on RZ/A, so no driver changes are
required. The fallback compatible string "renesas,rspi-rz" will be used
on RZ/V2L.
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20220227225956.29570-1-prabhakar.mahadev-lad.rj@bp.renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/spi/renesas,rspi.yaml

@@ -22,6 +22,7 @@ properties:
               - renesas,rspi-r7s72100  # RZ/A1H
               - renesas,rspi-r7s9210   # RZ/A2
               - renesas,r9a07g044-rspi # RZ/G2{L,LC}
+              - renesas,r9a07g054-rspi # RZ/V2L
           - const: renesas,rspi-rz     # RZ/A and RZ/G2{L,LC}
 
       - items:
@@ -124,6 +125,7 @@ allOf:
             enum:
               - renesas,qspi
               - renesas,r9a07g044-rspi
+              - renesas,r9a07g054-rspi
     then:
       required:
         - resets