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

Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/53f5d67c84695d7d507384d981423df94ea2a201

[A75] fix platform name detection at SPL

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/2413751ea997cc36590ca29930ec0d00d5541a9c

[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/d1ebc5a0fe9a9b95ceb926cd0595a530f9015bc1

[A75] fix boot device detection

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/13e3138dbad845ceaf80deb77500d5f47123b8de

[962] 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/6cb38529eb6a8082e6da2308246a095da3cddde0

[A75] remove HDMI-LVDS and LVDS-HDMI framebuffer confict

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/7cd70531373f3ec2cad3f98104dc97dfc52f4145

[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/1bdbb41ae9964b3a6b95dcafc29d8feece746359

[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/377597f7e83ddf887c400d49ff093ab3b61875ad

[A75] update seco_config constants names

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/5084f0abb696ff02046497e06a576b08819ab1b6

[A75] update ram calibration values for 2x512M configuration