[v2022.10.0] initcall of of_probe_memory failed (EBUSY)

[Ian Abbott]

Barebox v2022.10.0 seems to work for me, but I now get this (harmless?) 
error during initialization:

initcall of_probe_memory+0x1/0x34 failed: Device or resource busy

(This is on a 32-bit ARM SoCFPGA/CycloneV based system.)

git bisect is blaming commit d0b5f6bde15b ("of: reserved-mem: reserve 
regions prior to mmu_initcall()").

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