cifs: SMB1 split: Move some SMB1 receive bits to smb1transport.c

cifs: SMB1 split: Move some SMB1 receive bits to smb1transport.c

Move some SMB1 receive bits to smb1transport.c from smb1ops.c where they're
mixed in with unrelated code to do with encoding, decoding and processing
PDUs.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Steve French <sfrench@samba.org>
cc: Paulo Alcantara <pc@manguebit.org>
cc: Enzo Matsumiya <ematsumiya@suse.de>
cc: linux-cifs@vger.kernel.org
cc: linux-fsdevel@vger.kernel.org
cc: linux-kernel@vger.kernel.org
Acked-by: Enzo Matsumiya <ematsumiya@suse.de>
Signed-off-by: Steve French <stfrench@microsoft.com>