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"./sunxi-fel --list" enumerates Allwinner USB devices that
are in FEL mode. For each device detected, the SoC name/ID
and - if available - the SID key will be printed to stdout.
The utility then exits with status code 0 (upon success),
or 1 if no devices were found.

The current implementation treats the list feature as an option,
to be able to handle it *before* the first attempt to call
feldev_open() - which could fail (with no FEL devices connected).
However, a "list" alias is available for users who expect this
to be 'command' syntax, so "./sunxi-fel list" works too.
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>