Integrate u-boot-seco-imx/seco_lf_v2021.04_develop_c72n_ym

Commit: edgehog/bsp/nxp/u-boot-seco-imx@db049d2e

[C72n] add automatic DSI bridge detection via i2c

there are 2 possible option for the DSI bridge:

• SN65DSI84 DSI to LVDS
• SN65DSI86 DSI to eDP they are both mounted on the i2c bus 1, but at different address, so we can detect which is present by probing; we use this information to provide only suported video modes options

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Commit: edgehog/bsp/nxp/u-boot-seco-imx@61727268

[C72n][DTS] add mcu_rdc definition from evk

fix SPL warning: "Failed to find node!, err: -1!"

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Commit: edgehog/bsp/nxp/u-boot-seco-imx@3868ef03

[C72n][DEFCONFIG] add SECO_ECOSYSTEM flags

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Commit: edgehog/bsp/nxp/u-boot-seco-imx@aa4c9a42

[C72n][DEFCONFIG] add defconfig

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Commit: edgehog/bsp/nxp/u-boot-seco-imx@435f543d

[C72n] add overlays file name definition

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Commit: edgehog/bsp/nxp/u-boot-seco-imx@d9444df3

[C72n] enable usdhc_devno definition in proto_seco.h

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Commit: edgehog/bsp/nxp/u-boot-seco-imx@8d2b9f90

[C72n] add strap_cfg for board type detection

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Commit: edgehog/bsp/nxp/u-boot-seco-imx@7fd470dd

[I.MX8M][C72n] add C72 Nano DDR4 board to imx8m Kconfig

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Commit: edgehog/bsp/nxp/u-boot-seco-imx@32630ad6

[C72n] add platform support

new file:   board/seco/imx8mn_c72/Kconfig
new file:   board/seco/imx8mn_c72/Makefile
new file:   board/seco/imx8mn_c72/ddr4_timing.c
new file:   board/seco/imx8mn_c72/imx8mn_c72.c
new file:   board/seco/imx8mn_c72/spl.c

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Commit: edgehog/bsp/nxp/u-boot-seco-imx@a9ebaee3

[C72n][DTS] add devicetree for u-boot

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Commit: edgehog/bsp/nxp/u-boot-seco-imx@678cb2f4

[C72n] create board folder with env_conf.h

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Commit: edgehog/bsp/nxp/u-boot-seco-imx@d3016015

[C72n] add board configuration inside include/configs