ASoC: dt-bindings: renesas,rz-ssi: Document RZ/Five SoC

The SSI block on the RZ/Five SoC is identical to one found on the RZ/G2UL
SoC. "renesas,r9a07g043-ssi" compatible string will be used on the RZ/Five
SoC so to make this clear and to keep this file consistent, update the
comment to include RZ/Five SoC.

No driver changes are required as generic compatible string
"renesas,rz-ssi" will be used as a fallback on RZ/Five SoC.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20231115213358.33400-1-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>