iw: Update to version 5.19

iw: Update to version 5.19

- Update from version 5.9 to 5.19
- Update of rootfile not required
- Changelog is not avaqilable in the source tarball or on the iw website. Details of
   changes only available by reviewing all commits between the two versions in the git
   repository
   https://git.kernel.org/pub/scm/linux/kernel/git/jberg/iw.git/log/

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Reviewed-by: Peter Müller <peter.mueller@ipfire.org>