smb: move some duplicate definitions to common/smb2pdu.h

smb: move some duplicate definitions to common/smb2pdu.h

In order to maintain the code more easily, move duplicate definitions to
common header file.

There are only 4 different definitions, the client uses cpu_to_le16()
but the server does not:

  - RSS_CAPABLE
  - RDMA_CAPABLE
  - INTERNETWORK
  - INTERNETWORKV6

The other definitions are exactly the same on both client and server.

The struct smb_hdr is defined in MS-CIFS and MS-SMB, but it's also used by
SMB2 and SMB3, so move it to the common smb2pdu.h.

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>