antfs: drop this kernel package

antfs: drop this kernel package

Reasons to remove this package:

1. It is not available for Linux kernel 5.15 and onwards.
2. It seems that it is not maintained as the original repository was
   done in 2018 and then the forked repository was done to have this
merged only to OpenWrt.
3. Anyone can use ntfs-3g (fuse) or ntfs3 from Paragon, which has been
   available since Linux kernel 5.15
4. Nobody said why this package was necessary or required to be added
   here or what was the difference between driver(s) in the Linux kernel and
this package.
5. No project home page, no documentation, only source code provided by
   AVM

Signed-off-by: Josef Schlehofer <pepe.schlehofer@gmail.com>