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[IMX8MM][MYON2] Automatically apply DT overlay specific to board revision

Dmitry Petrov requested to merge seco_lf_v2021.04_develop_myon2-imx8mm-board-rev-overlay into seco_lf_v2021.04

This MR fixes the first problem from !152 (comment 463054):

board_revision should be automatically selected, and not via seco_config

The commit introduces a new routine for loading and applying the overlay of the device tree, depending on the detected revision of the board. This routine is stored in the fdt_overlay_board_rev env variable.

In order to execute this code after the loading of the dtb, we overwrite the command fdt_overlay_load2ram (MACRO_ENV_FDT_LOAD_OVERLAY_BASE).

Edited by Dmitry Petrov

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