fdt: Implement weak arch_fixup_fdt()

Only ARM and in some configs MIPS really implement arch_fixup_fdt().
Others just use the same boilerplate which is not good by itself,
but what's worse if we try to build with disabled CONFIG_CMD_BOOTM
and enabled CONFIG_OF_LIBFDT we'll hit an unknown symbol which was
apparently implemented in arch/xxx/lib/bootm.c.

Now with weak arch_fixup_fdt() right in image-fdt.c where it is
used we get both items highlighted above fixed.

Signed-off-by: Alexey Brodkin <[email protected]>
Cc: Daniel Schwierzeck <[email protected]>
Cc: Simon Glass <[email protected]>
Cc: York Sun <[email protected]>
Cc: Stefan Roese <[email protected]>
Reviewed-by: Tom Rini <[email protected]>
Reviewed-by: Daniel Schwierzeck <[email protected]>

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