smb: move copychunk definitions to common/smb2pdu.h

smb: move copychunk definitions to common/smb2pdu.h

Rename 3 places:

  - copychunk_ioctl -> copychunk_ioctl_req
  - copychunk -> srv_copychunk
  - server: ResumeKey -> SourceKeyU64

Merge the struct members of the server and the client, then move duplicate
definitions to common header file.

Co-developed-by: ChenXiaoSong <chenxiaosong@kylinos.cn>
Signed-off-by: ChenXiaoSong <chenxiaosong@kylinos.cn>
Signed-off-by: ZhangGuoDong <zhangguodong@kylinos.cn>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>