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

Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/be490d853e8c792dbbc019206f403fbaa2f044b5

[D18] enable SECO_ECOSYSTEM flag, resize u-boot environment

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/f7b78577df0ffebfddf7fd6cb81ba2c4dee19791

[D18] add seco_config overlay options

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/0deeac027068c61d73d19051ca8e11f091494650

[D18] enable u-boot ethernet ports, enable kernel wifi probing

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/41b3a229f7c1993bbe7cf2dd2b6c52c37c679167

[D18] disable u-boot video output

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/e43f759c225364fbcefbad8e152792138051ef21

[D18] add enable pullup dts flags for gpio expander driver

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/9e5e41e0d1f03ab74b64e05f79c345775c08c4af

[D18] add SECO environment, set mmc enumeration

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/7702b1c00b50fad47560484794509f42c3705f08

[D18] add dynamic RAM size, straps management

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/ebfc0c5207ddcbb07cd64d58ea5d5880ec6ede47

[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/affde226e04838ac9828eac68e2edf0983e2fa58

[D18][SPL] Ext Card: fix write protect

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/891ffd2756b618501349b4199753fc56b988a7b3

[D18][DTS] Ext Card: fix voltage to 3.3V

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/6f429044b62836b0d19fe1fbbfd301c2ffec226b

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