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mx8:env: set address for custom mem logo

Dmitry Petrov requested to merge mem-logo-env into guf_imx_v2020.04-trizeps8plus_2021_12_07

A MR for generic "bootlogo mx8mp" task, which was provided without specific ID number.

Define a variable in the initial U-Boot environment for i.MX8 to store an address with memory reserved for a custom logo. The logo will be loaded by boot.scr script if it exists on the boot partition of storage.

The solution from i.MX6 boards cannot be used, because of i.MX8 boards uses ordinary U-Boot instead of FNG-Boot.

This address hard-coded in U-Boot and also reserved in kernel device trees — see seco-ne/kernel/linux-imx-kuk!465 (merged)

Edited by Dmitry Petrov

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