[PATCH v3] imx8mm-cl-iot-gate: Split the defconfigs

[sbabic at denx.de]

> Currently imx8mm-cl-iot-gate_defconfig fails to produce a working boot
> binary due to the lack of fip.bin:
> "  BINMAN  all
> Image 'main-section' is missing external blobs and is non-functional: blob-ext
> Some images are invalid"
> To make the build process more consistent with the other i.MX8M targets,
> split the defconfig in two:
> - imx8mm-cl-iot-gate_defconfig: standard defconfig that only 
> requires ATF / DDR firmware.
> - imx8mm-cl-iot-gate-optee_defconfig: "more advanced" defconfig that
> requires ATF / Optee / mbedtls / DDR firmware.
> Signed-off-by: Fabio Estevam <festevam at denx.de>
> Tested-by: Ying-Chun Liu (PaulLiu) <paul.liu at linaro.org>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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