Make the commandline options consistent and complete:

  - option "-h" already had a long equivalent "--help", so reflect that in the
    usage() message.
  - for option "-q" the usage() message promised a long equivalent "--quiet"
    that did not exist.
  - the call to getopt_long() already allowed the option "-f" in its optstring,
    but the usage() message said nothing about it, hence amend that and offer
    the long option "--force" as well.

Signed-off-by: Ulrich Ölmann <u.oelmann@pengutronix.de>
Signed-off-by: Roland Hieber <rhi@pengutronix.de>