tree d19c31e26ee05a0b793d0011683054a4fe99f3dc
parent 01617af254baf6882ac8373b4364b13428031d82
author David Brown <david.brown@linaro.org> 1551376490 -0700
committer David Brown <davidb@davidb.org> 1555474821 +0700

sim: Move `Images` to before code

Rust convention is to have types before implementation.  Move `Images`
up to the top to make it more prominent.  This is also a good
opportunity to add a bit of a comment to this struct.

Signed-off-by: David Brown <david.brown@linaro.org>