fwserial: (coding style) removing FSF postal address

Style-only modifications to make checkpatch.pl --file --strict a bit happier.
Removing FSF postal address from file top comment since it has changed in the
past, as stated by checkpatch.pl.

Signed-off-by: Dominique van den Broeck <domdevlin@free.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>