configs: visionfive2: enable CONFIG_CMD_ERASEENV

When moving from vendor U-Boot to the upstream U-Boot it is necessary to
reset the environment.

Provide the 'env erase' sub-command.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
diff --git a/configs/starfive_visionfive2_defconfig b/configs/starfive_visionfive2_defconfig
index 511645c..c350892 100644
--- a/configs/starfive_visionfive2_defconfig
+++ b/configs/starfive_visionfive2_defconfig
@@ -62,6 +62,7 @@
 CONFIG_SPL_SPI_LOAD=y
 CONFIG_SPL_YMODEM_SUPPORT=y
 CONFIG_SYS_PROMPT="StarFive # "
+CONFIG_CMD_ERASEENV=y
 CONFIG_CMD_EEPROM=y
 CONFIG_SYS_EEPROM_SIZE=512
 CONFIG_SYS_EEPROM_PAGE_WRITE_BITS=4