configs: j721s2_evm: Enable configs to store env in MMC FAT partition

J721S2 EVM used to store env on eMMC, since EVM and SK uses same
defconfig and there is no eMMC on SK, we need to keep env in an
interface which available on both EVM and SK. So, save env in FAT
partition of MMC SD Card.

Enable defconfigs relevant for storing env on FAT partition of MMC.

Signed-off-by: Sinthu Raja <sinthu.raja@ti.com>
diff --git a/configs/j721s2_evm_r5_defconfig b/configs/j721s2_evm_r5_defconfig
index 7cdded6..1f2102a 100644
--- a/configs/j721s2_evm_r5_defconfig
+++ b/configs/j721s2_evm_r5_defconfig
@@ -88,6 +88,7 @@
 CONFIG_SPL_OF_LIST="k3-j721s2-r5-common-proc-board k3-am68-sk-r5-base-board"
 CONFIG_SPL_MULTI_DTB_FIT_NO_COMPRESSION=y
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y
+CONFIG_ENV_OVERWRITE=y
 CONFIG_SPL_DM=y
 CONFIG_SPL_DM_SEQ_ALIAS=y
 CONFIG_REGMAP=y