kernel: add CONFIG_CIFS_* like Fedora, Ubuntu

The plan is to fix mounting DFS shares on NixOS (for which some of these
options are needed), but I figured it might be a good idea to enable all
CONFIG_CIFS_* like Fedora 24 and Ubuntu 16.04 while at it. Ubuntu even
has CONFIG_CIFS_SMB311, but as Fedora do not, I left it out.

Mounting DFS shares still doesn't work; need to configure cifs.upcall
and /etc/request-key.conf. Until then, using GVFS as a workaround.