Assorted cleanups and extensions for ftdump

This patch makes a number of minor changes to the ftdump debugging
tool.

 * There was an endian bug in one place, which this fixes.

 * We now use const qualifiers in a number of places where we can

 * ftdump can now be instructed to read from stdin by giving "-" as
   the filename.

 * The buffer into which the blob is read is increased from 16k to
   64k, and is now dynamically allocated.

 * ftdump now emits source in dts-v1 format

Since ftdump is little used these days, these fixes are arguably of
little use.  On the other hand, I already did the work of making the
changes some time back, so I guess we might as well fold these small
fixes and improvements in.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

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