[PATCH dtc] Implement the -R option and add a -S option.

[Jon Loeliger]

So, like, the other day Jerry Van Baren mumbled:
> Implement the -R <number> option to add memory reserve slots.
> Add a -S <size> option makes the blob at least this number of bytes.
> 
> Signed-off-by: Gerald Van Baren <vanbaren at cideas.com>

Applied.

Thanks,
jdl