ksmbd: release 3.4.0 version
Major changes are:
- add support for SMB3 multichannel.
- add support for FSCTL_DUPLICATE_EXTENTS_TO_FILE.
- add support for AES256 encryption.
- rename cifsd to ksmbd.
- use generic asn1 decoder instead of own one.
- remove cache read/trans buffer feature.
- fix several bugs.
- cleanup codes from review comments.