Integrate meta-seco-imx/u-boot-seco-imx/seco_lf_v2021.04-gm_c12

Commit: https://git.seco.com/edgehog/layers/seco/meta-seco-imx/-/commit/3787b94fd8ec1d461534aa369954406b70fe5cef

Integrate u-boot-seco-imx/seco_lf_v2021.04-gm_c12

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/a0ff508f247702fd5cc20531ef87bb796eba74af

[C12] 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/94cf97ab8479a10a03b0299b5e6f2783df6166d0

[C12] remove redundant overlay

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/2796632e335934364bcd294d4b1e3967f60dad90

[C12] fix SD boot issue, upgrade straps management

• code refactoring
• add SD to boot list
• fix straps recognition
• complete board strap print
• CPU, PCIe straps: update devicetree
• HDMI/DP, SPI | CAN/RTC straps: select video and peripherals overlay lists (multiple configurations)
  • for seco_config tool
  • HDMI video option
  • WIFI, CAN/RTC peripherals options