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

Commit: edgehog/layers/seco/meta-seco-imx@41796fba

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

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Commit: edgehog/bsp/nxp/u-boot-seco-imx@07bc69be

[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

NOTE: LVDS bridge is not yet supported by the kernel

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Commit: edgehog/bsp/nxp/u-boot-seco-imx@07395de3

[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@d6f5bc7e

[C72n][DEFCONFIG] add SECO_ECOSYSTEM flags

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Commit: edgehog/bsp/nxp/u-boot-seco-imx@9f2a6d32

[C72n][DEFCONFIG] add defconfig

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Commit: edgehog/bsp/nxp/u-boot-seco-imx@29168515

[C72n] add overlays file name definition

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Commit: edgehog/bsp/nxp/u-boot-seco-imx@268baa37

[C72n] enable usdhc_devno definition in proto_seco.h

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Commit: edgehog/bsp/nxp/u-boot-seco-imx@2321b3b3

[C72n] add strap_cfg for board type detection

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Commit: edgehog/bsp/nxp/u-boot-seco-imx@3dbb48eb

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

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Commit: edgehog/bsp/nxp/u-boot-seco-imx@769a989b

[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@ef47dc44

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

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Commit: edgehog/bsp/nxp/u-boot-seco-imx@4f47f5a2

[C72n] create board folder with env_conf.h

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Commit: edgehog/bsp/nxp/u-boot-seco-imx@92e87311

[C72n] add board configuration inside include/configs