configs: khadas-vim3*_android: fix environment saving

The environment is used to configure some additional boot features such as:
* extra boot arguments
* enable AVB (Android Verified Boot) verification

Right now, we cannot store it in eMMC:

  Loading Environment from nowhere... OK

Fix it by enabling the appropriate options in the defconfig

Fixes: b749d5ecdc06 ("configs: meson64_android: define raw parts for bootloader")
Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20231026-fix-saveenv-v1-1-6aa59be65481@baylibre.com
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
diff --git a/configs/khadas-vim3l_android_ab_defconfig b/configs/khadas-vim3l_android_ab_defconfig
index 0d6de80..8f32f8e 100644
--- a/configs/khadas-vim3l_android_ab_defconfig
+++ b/configs/khadas-vim3l_android_ab_defconfig
@@ -7,6 +7,7 @@
 CONFIG_HAS_CUSTOM_SYS_INIT_SP_ADDR=y
 CONFIG_CUSTOM_SYS_INIT_SP_ADDR=0x20000000
 CONFIG_ENV_SIZE=0x10000
+CONFIG_ENV_OFFSET=0x0
 CONFIG_DM_GPIO=y
 CONFIG_DEFAULT_DEVICE_TREE="meson-sm1-khadas-vim3l"
 CONFIG_OF_LIBFDT_OVERLAY=y
@@ -45,7 +46,10 @@
 CONFIG_CMD_REGULATOR=y
 CONFIG_CMD_AVB=y
 CONFIG_OF_CONTROL=y
+CONFIG_ENV_IS_IN_MMC=y
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y
+CONFIG_SYS_MMC_ENV_DEV=2
+CONFIG_SYS_MMC_ENV_PART=2
 CONFIG_ADC=y
 CONFIG_SARADC_MESON=y
 CONFIG_BUTTON=y