Convert CONFIG_ENV_OVERWRITE to Kconfig

This converts the following to Kconfig:
   CONFIG_ENV_OVERWRITE

Signed-off-by: Adam Ford <aford173@gmail.com>
[trini: Rerun migration, remove some comments]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/kmcoge5ne_defconfig b/configs/kmcoge5ne_defconfig
index 3630992..733e7f3 100644
--- a/configs/kmcoge5ne_defconfig
+++ b/configs/kmcoge5ne_defconfig
@@ -182,6 +182,7 @@
 CONFIG_MTDPARTS_DEFAULT="mtdparts=boot:768k(u-boot),128k(env),128k(envred),-(ubi0);app:-(ubi1);"
 CONFIG_CMD_UBI=y
 # CONFIG_CMD_UBIFS is not set
+CONFIG_ENV_OVERWRITE=y
 CONFIG_SYS_REDUNDAND_ENVIRONMENT=y
 CONFIG_ENV_ADDR=0xF00C0000
 CONFIG_ENV_ADDR_REDUND=0xF00E0000