spi: renesas,sh-msiof: R-Car V3U is R-Car Gen4

Despite the name, R-Car V3U is the first member of the R-Car Gen4
family. Hence move its compatible value to the R-Car Gen4 section.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/20220824094327.33685-4-wsa+renesas@sang-engineering.com


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