spi: renesas,sh-msiof: Add r8a779h0 support

Document support for the Clock-Synchronized Serial Interface with FIFO
(MSIOF) in the Renesas R-Car V4M (R8A779H0) SoC.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/68a4d8ad8638c1133e21d0eef87e8982ddea3dd8.1713279687.git.geert+renesas@glider.beSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/spi/renesas,sh-msiof.yaml

@@ -54,6 +54,7 @@ properties:
               - renesas,msiof-r8a779a0      # R-Car V3U
               - renesas,msiof-r8a779f0      # R-Car S4-8
               - renesas,msiof-r8a779g0      # R-Car V4H
+              - renesas,msiof-r8a779h0      # R-Car V4M
           - const: renesas,rcar-gen4-msiof  # generic R-Car Gen4
                                             # compatible device
       - items: