reports: footprint: Print footprint output

Both ram and rom reports print their outputs in the console
and publish their reports in json.

footprint is wrapper to generate both reports but it is currently
not printing their outputs in the console nor given any feedback to
the user that those reports were generated.

Change it to behave like the others reports allowing the user to see them
and / or redirect to a file if they want.

Signed-off-by: Flavio Ceolin <flavio.ceolin@gmail.com>