dtc: Use libfdt endian conversion functions in libfdt

[Jon Loeliger]

> Following on from the last patch, which made dtc use the same endian
> conversion functions as libfdt, this patch makes ftdump use these
> functions as well.  This brings us down to a single set of endian
> handling functions in all of dtc and libfdt, so just one place to fix
> things.
> 
> Signed-off-by: David Gibson <david at gibson.dropbear.id.au>

Applied.

jdl