imx8mq_evk: Move CONFIG_ENV_IS_IN_MMC to Kconfig

Currently the command "saveenv" is not available.

The CONFIG_ENV_IS_IN_MMC symbol has been converted to Kconfig,
so fix the problem by moving it to the defconfig.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
2 files changed