soc: renesas: R-Car V3U is R-Car Gen4

Despite the name, R-Car V3U is the first member of the R-Car Gen4
family.  Hence reflect this in the SoC Family field.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/2bbecad7b6c24c0d5c1797b3f7f0733d5ba33842.1651497066.git.geert+renesas@glider.be

drivers/soc/renesas/renesas-soc.c

@@ -232,7 +232,7 @@ static const struct renesas_soc soc_rcar_d3 __initconst __maybe_unused = {
 };
 
 static const struct renesas_soc soc_rcar_v3u __initconst __maybe_unused = {
-	.family	= &fam_rcar_gen3,
+	.family	= &fam_rcar_gen4,
 	.id	= 0x59,
 };