boot: add support for fdt_fixup command in environment

The "fdt" command is convenient for making small changes to the OS FDT,
especially during development. This is easy when the kernel and FDT are
loaded separately, but can be cumbersome for FIT images, requiring to
unpack the image, manually apply overlays, etc.

Add an option to execute a command "fdt_fixup" from the environment at
the beginning of image_setup_libfdt() (after overlays are applied, and
before the other fixups).

Signed-off-by: Matthias Schiffer <matthias.schiffer@ew.tq-group.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

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