i2c: rcar: Prepare for the advent of ARCH_RCAR_GEN4

Currently, all Kconfig symbols for R-Car Gen4 SoCs select
ARCH_RCAR_GEN3, which might confuse the casual reader.  Prepare for the
advent of ARCH_RCAR_GEN4 by extending the dependency for auto-selecting
reset controller support.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>

drivers/i2c/busses/Kconfig

@@ -1235,7 +1235,7 @@ config I2C_RCAR
 	depends on ARCH_RENESAS || COMPILE_TEST
 	select I2C_SLAVE
 	select I2C_SMBUS
-	select RESET_CONTROLLER if ARCH_RCAR_GEN3
+	select RESET_CONTROLLER if ARCH_RCAR_GEN3 || ARCH_RCAR_GEN4
 	help
 	  If you say yes to this option, support will be included for the
 	  R-Car I2C controller.