Integrate meta-seco-imx/u-boot-seco-imx/seco_lf_v2021.04_develop_ym_a75

Commit: https://git.seco.com/edgehog/layers/seco/meta-seco-imx/-/commit/eaf3b09ab968d36ae93eddffb79a790b98b14502

Integrate u-boot-seco-imx/seco_lf_v2021.04_develop_ym_a75

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/26237a48d6004441b7ff08c47d18374cab9bb6de

[A75] fix platform name detection at SPL

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/2bf0007b6ed20a3a71193277b9279464399cdd92

[A75] fix eMMC reset and pad control at SPL

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/1fca65d3c8a8c6cf343851f8d9b9c76672e80b8a

[A75] fix boot device detection

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/91fc22d02a405097499f4a82d77e745ab392e3e6

[A75] Remove HDMI-LVDS and LVDS-HDMI framebuffer conflict

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/2ba7e39b7dd4140f76c399e5262a84adff947cfa

[A75] fix HDMI kernel command line spec_list

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/d350da80ad84efe56c2ae1e88027e7710e614174

[A75] add overlays constants names to seco environment

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/1c5c97875bfd2477b96033242bf96b7c01aef16c

[A75] update seco_config constants names

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/61eea59d57f0628a00a6e10483e28273d5db26d3

[A75] update ram calibration values for 2x512M configuration