kismet: drop the package

kismet: drop the package

This package is no longer maintained in OpenWrt even though it is maintained by upstream.
The last update was done in August 2016 and because we have 2023, drop this package
without replacement.

If anyone from the community wants to step in and retake the maintainership together with the update,
feel free to do it.

Signed-off-by: Josef Schlehofer <pepe.schlehofer@gmail.com>
(cherry picked from commit 52def58084583ff070c107d8c5455fce780e4c32)