Integrate u-boot-seco-imx/seco_lf_v2021.04_develop_c72_hotfix

Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/a9b9fc1373ebbeac1ed521d9bd139347b13cba67

[C72n][DEFCONFIG] fix compilation issue

commit 0e6729a66e7e727f2513ee84f1258ae6f2d81fc5 breaks u-boot compilation because SPL do not use driver model; revert defconfig patch to fix it. Boot from eMMC is still supported