tools/imximage: fix DCD Blocks message output order

The correct order is load address, offset, length. The order was
accidentally switched a while ago; make it match the HAB Blocks output and
what CST expects again.

Fixes: e97bdfa5 ("tools/imximage: share DCD information via Kconfig")
Signed-off-by: Matthias Schiffer <matthias.schiffer@ew.tq-group.com>