Integrate meta-seco-imx/u-boot-seco-imx/seco_lf_v2021.04_develop_962_ym

Commit: https://git.seco.com/edgehog/layers/seco/meta-seco-imx/-/commit/a51b42b9d478fb97e99aeca9d2d27b6390de4329

Integrate u-boot-seco-imx/seco_lf_v2021.04_develop_962_ym

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/bfff99273f2d4bf8a40469d293eaeba95c96d167

[962] fix bus_id for eMMC

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/ac9f5027e0a4405d06a0dde7693d9e3e37a80284

[962] align SD boot device dev_type and device_id

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/8dd707e9820c5c599ab9421cfd57491b31410548

[962][ENV_CONF][MX6_DTBO] add overlay definition and update them in env_conf.h

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/5b9f745da1c9b81fe04339b1cb708868861849e1

[962] fix seco constants names and typos

• SECO_DEV becomes SECO_DEV_TYPE
• EXT_SD becomes SD_EXT
• FILE becomes FILENAME
• add ENV_DEFAULT_FDT_FILE
• use correct id for external sd instead of "0"

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/6ecfb67118aaca79af9bb3858baa180b0cb36982

[962] fix bus_id for External SD

print_boot_device() (board/seco/common/board_imx6.c) uses information contained in the CPU registers to identify the current boot device. The boot device is identified among the ones specified into boot_mem_dev_list; since commit f7da4b01, the function check if the bus id of the current boot device is equal to the one in boot_mem_dev_list; if this control fails, the boot device is skipped; if no boot device is identified, the boot device is considerd "Unknow". In order to corretly detect the boot device for 962 board we have to correctly specify the bus id.