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

The RSPI block on the RZ/Five SoC is identical to one found on the RZ/G2UL
SoC. "renesas,r9a07g043-rspi" 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,rspi-rz" 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/20231115205333.31076-1-prabhakar.mahadev-lad.rj@bp.renesas.com


Signed-off-by: Mark Brown <broonie@kernel.org>