Integrate meta-seco-imx/u-boot-seco-imx/seco_lf_v2021.04-gm_d18
requested to merge integrate/meta-seco-imx/u-boot-seco-imx/seco_lf_v2021.04-gm_d18/into/kirkstone into kirkstone
Integrate u-boot-seco-imx/seco_lf_v2021.04-gm_d18
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[D18] add 8GB RAM size support