pumpkin: set up env in EMMC

This reverts commit 6c049416613274d385a514ec3cdd6dbaf06476d7.

Note: also set it in pumpkin_android_defconfig

Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
diff --git a/configs/pumpkin_android_defconfig b/configs/pumpkin_android_defconfig
index 4e91736..57fef24 100644
--- a/configs/pumpkin_android_defconfig
+++ b/configs/pumpkin_android_defconfig
@@ -44,6 +44,7 @@
 # CONFIG_CMD_BLOCK_CACHE is not set
 # CONFIG_CMD_MISC is not set
 CONFIG_DEFAULT_DEVICE_TREE="mt8516-pumpkin"
+CONFIG_ENV_IS_IN_MMC=y
 CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG=y
 # CONFIG_NET is not set
 CONFIG_SPL_DM_SEQ_ALIAS=y