runners: restore obsolete synonyms for -i/--dev-id

This is a partial revert of commit
2cee5ff5
("scripts: west_commands: runners: remove deprecated options").

I remarked at the time that the removal of the older way of writing
things from the runners themselves seemed gratuitous since they are
easy to continue to support indefinitely and people may have been used
to the old way of doing things. It didn't seem worth the fight to push
for a revert at the time, though.

Since then I've run into real problems that their removal has caused
in the wild and I am convinced that this part of that patch was wrong.

Restore the original, undeprecated forms of these options, but make it
clear in the command line help that they're just obsolete alternative
spellings at this point.

Signed-off-by: Marti Bolivar <marti.bolivar@nordicsemi.no>