copy-firmware: make script smarter about bad parameters

copy-firmware: make script smarter about bad parameters

Two improvements to copy-firmware.sh that make it more friendly
when passed unknown or not exactly correct command-line parameters.

1) Don't fail with a weird error if there's a space between -j and
   the number.

2) Ignore any command-line unsupported parameters that start with
   a dash.  This is necessary because otherwise the script will
   assume the option is actually a destination directory, and then
   the "test" command will get confused.  Drawback is that we don't
   support any more destination directories that start with a dash,
   but no one does that.

Signed-off-by: Timur Tabi <ttabi@nvidia.com>