common/spl: use memmove() in load_simple_fit()

I had trouble booting some am335x boards (both
beagleboneblack and a custom board). SPL would start just fine, and
apparently load U-Boot proper, but it would hang when jumping to
U-Boot.

While debugging, I stumbled on this memcpy() which from code
inspection very much looked to have overlapping src and dst, and
indeed a simple printf revealed

  calling memcpy(0x8087bf68, 0x8087bf80, 0xf7f8)

Now, it will always be with src > dst, our memcpy()
implementations "most likely" do forward-copying, and in the end it
turned out that this wasn't the culprit after all [*].

But to avoid me or others barking up the wrong tree in the future, and
because this use of memcpy() is technically undefined, use memmove()
instead.

[*] That was 358d1cc232c ("spl: Align FDT load address"), which has
since been fixed in master but not the v2025.07 I worked of by
52caad0d14a ("ARM: Align image end to 8 bytes to fit DT alignment").

Signed-off-by: Rasmus Villemoes <[email protected]>
Reviewed-by: Heinrich Schuchardt <[email protected]>

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