configs: mt8183_evb_android: use environment stored in MMC

The environment is currently not loaded from MMC and it is impossible
to save any modification.
This commit change this behavior in order to load and store the
environment in the eMMC.

Signed-off-by: Fabien Parent <fparent@baylibre.com>
diff --git a/configs/mt8183_evb_android_defconfig b/configs/mt8183_evb_android_defconfig
index a1d56a0..16e9b07 100644
--- a/configs/mt8183_evb_android_defconfig
+++ b/configs/mt8183_evb_android_defconfig
@@ -44,6 +44,7 @@
 # CONFIG_CMD_BLOCK_CACHE is not set
 # CONFIG_CMD_MISC is not set
 CONFIG_DEFAULT_DEVICE_TREE="mt8183-evb"
+CONFIG_ENV_IS_IN_MMC=y
 CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG=y
 # CONFIG_NET is not set
 CONFIG_SPL_DM_SEQ_ALIAS=y