spi: sh-msiof: add generic Gen4 binding

No further changes in this generation discovered yet.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/20220824094327.33685-3-wsa+renesas@sang-engineering.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-sh-msiof.c

@@ -1085,6 +1085,7 @@ static const struct of_device_id sh_msiof_match[] = {
 	{ .compatible = "renesas,rcar-gen2-msiof", .data = &rcar_gen2_data },
 	{ .compatible = "renesas,msiof-r8a7796",   .data = &rcar_gen3_data },
 	{ .compatible = "renesas,rcar-gen3-msiof", .data = &rcar_gen3_data },
+	{ .compatible = "renesas,rcar-gen4-msiof", .data = &rcar_gen3_data },
 	{ .compatible = "renesas,sh-msiof",        .data = &sh_data }, /* Deprecated */
 	{},
 };