Integrate u-boot-seco-imx/seco/lf_v2021.04/develop_c61_ym

Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/bbe2ddf46ebccf37c279b95dfc3877294ac690be

[iMX8][C61] add overlays file name definition

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/ed6cb4b758485b13ba354b0977bf57e0e701aea4

[iMX8][C61] fix names and includes

• We use BOOT_DEV_ID_SD for the uSD device id representing the only uSD slot on SBC boards like C61; in this case we can also define SCFG_BOOT_DEV_ID_SD_EXT and SCFG_ROOT_DEV_ID_SD_EXT with value "0", despite never use them.

• Replace inclusion of imx_env.h with seco_common.h

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/6bf46fb67e5cdf1aa59c0786807d3155d91938e4

[iMX8][C61][DTS] move ethernet phy flags to correct phy node

in order to use internal delays for rgmii-id (1Gb/s), we need to provide internal delays inside the phy node. We also provide ethernet connector leds configuration.

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/bf195a7025ad50739d0dab43a4ed51b9bdf3bd83

[iMX8][C61][DEFCONFIG] enable TI DP83867 ethernet phy dm driver

we need to enable generic TI PHY support and specific support for DP83867. before: u-boot=> mdio list FEC0: 9 - Generic PHY <--> ethernet@30be0000 after: u-boot=> mdio list FEC0: 9 - TI DP83867 <--> ethernet@30be0000

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/20748a0dfdc59e84193843888768c05f541e1657

[iMX8][C61][SPL] remove redundant definition of spl_board_boot_device()

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/6446544575331c8acf7bb1fb1d46e401bd54aa35

[iMX8M][C61] add C61 board-specific header file

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/ddc89fa8bbba6129d870f49fb2dae5c21f66e0e3

[iMX8][C61] C61 wdog support

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/f28b9548b86a0c614bcd3f7a5374670e878e6885

[iMX8][C61][DEFCONFIG] add C61 defconfig file

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/462d2b05971dac144e78e14980cf470bb853b37d

[iMX8][C61] update usdhc_devno definition for C61

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/22662216cb648997d3420a69d72b0f6ec194f0fd

[iMX8][SPL] select correct SPL boot devices for iMX8MM

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/35f052f1358b8a5b9d6765968c8152ffaeae090e

[iMX8][C61] addition of C61 platform-specific files

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/8d1bf1cecc067a76a822a566501230383f87efe7

[iMX8][C61] add C61 to iMX8M Kconfig, create C61 board folder

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/8eb596ce4a0947758c386e960d520414af650405

[iMX8][C61][DTS] Add devicetree files for C61 board (iMX8MM)