configs: imx8mm-cl-iot-gate: enable extension command

For imx8mm-cl-iot-gate we can use extension command to scan
extension boards attached on the mainboard. We enable the
extension command by default for users to detect the extension
boards.

Signed-off-by: Ying-Chun Liu (PaulLiu) <paulliu@debian.org>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: NXP i.MX U-Boot Team <uboot-imx@nxp.com>
2 files changed