ARM: renesas: Consistently enable ENV_OVERWRITE on Renesas R-Car

Move CONFIG_ENV_OVERWRITE=y into commont renesas_rcar.config to make sure
this configuration option is consistently enabled on all of Renesas R-Car
Gen2, Gen3, Gen4. Currently this option is not enabled on Gen4, this fix
corrects that omission.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>

configs/renesas_rcar.config

@@ -17,6 +17,7 @@ CONFIG_DM_REGULATOR_FIXED=y
 CONFIG_DM_REGULATOR_GPIO=y
 CONFIG_DM_SPI=y
 CONFIG_DM_SPI_FLASH=y
+CONFIG_ENV_OVERWRITE=y
 CONFIG_FIT=y
 CONFIG_HUSH_PARSER=y
 CONFIG_MTD=y

configs/renesas_rcar2.config

@@ -14,7 +14,6 @@ CONFIG_CMD_USB=y
 CONFIG_CUSTOM_SYS_INIT_SP_ADDR=0x4f000000
 CONFIG_ENABLE_ARM_SOC_BOOT0_HOOK=y
 CONFIG_ENV_IS_IN_SPI_FLASH=y
-CONFIG_ENV_OVERWRITE=y
 CONFIG_ENV_SECT_SIZE=0x40000
 CONFIG_ENV_SIZE=0x40000
 CONFIG_HAS_CUSTOM_SYS_INIT_SP_ADDR=y

configs/renesas_rcar3.config

@@ -2,5 +2,4 @@
 
 CONFIG_BITBANGMII=y
 CONFIG_BITBANGMII_MULTI=y
-CONFIG_ENV_OVERWRITE=y
 CONFIG_SYS_PBSIZE=2068