Integrate meta-seco-imx/u-boot-seco-imx/seco_lf_v2021.04-gm_d18

Commit: https://git.seco.com/edgehog/layers/seco/meta-seco-imx/-/commit/fb0c4dd808816219215de750b406520f7f2f2cff

Integrate u-boot-seco-imx/seco_lf_v2021.04-gm_d18

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/df7e99c3f1d79baab4aee7dccb99da18681979a2

[D18] use SECO custom U-Boot prompt text

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/93b10015317192711c97649243eca6eed39df60f

[D18] fix boot options typos

• select root variables for filesystem device list

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/a2f522219d5c2c54305cdc3cc780747a84dcdb1a

[D18] upgrade straps management

• fix board revision straps recognition
• add ETH1 and eDP straps (gpio expander) recognition
• add board strap and gpio expander strap print
• ETH1 strap: update devicetree
• add video overlay lists (multiple configurations)
  • for seco_config tool
  • HDMI, eDP, LVDS options
• eDP strap: select video overlay list

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/dbb43dad4d3b25c179c29ea08e60cacdd76c1b18

[D18] add second audio peripheral overlay list

• for seco_config tool
• bluetooth audio option

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/da200cc42c95895a17eef109617c5f4596d7ac0c

[i.MX8MP][D18] add initial dtbo parameters for seco_config

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/0de5cf5492a104ab97b36e7df7932cf1df12f528

[D18] add board to SECO build ecosystem, resize u-boot environment

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/5c4b61a1b83bf65c7bbd47799b61b78d657feab8

[D18] enable ethernet ports

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/752f71ac1bfd05bb23705a37d67cada6f5315d22

[D18] set gpio expander strap pull-up

• P1_6 --> SECO_CODE_7 (eDP)
• P1_7 --> SECO_CODE_8 (ETH1)

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/4f0901e1531d4466beaa5d420fac1e7d27320e3d

[D18] enable gpio expander

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/f72b7576a8c218ee4e8a28793ea49919940aee9e

[D18] disable u-boot video output

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/353dea8889e79240e8d8128d5fb2da5c97b99b23

[D18] setup SECO environment, set MMC enumeration

• internal eMMC --> device 0
• external SD --> device 1

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/366388be149f7a73d8ac03d0bf01944c923f57b3

[D18] add dynamic RAM size support

• initial support for board straps management
• WARNING: 8GB ram size is not working

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/65b54fdeb039e372c0a470e48e66f2233e59f520

[i.MX8] make spl_board_boot_device overwritable by specific board implementation

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/ff1f0d02df2bb64709ce59f94097c95afbfee51f

[D18] external SD: fix write protect

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/4a6153d202f1090cccc21ae0778ba50df1fba56f

[D18] external SD: fix voltage to 3.3V

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/c31f2c15a31fb789b625d8b2dced05c3b3a43c85

[i.MX8MP][D18] init porting derived from nxp imx8mp_evk