sepolicy: allow dpmd to create self socket and netlink socket.

dpmd process needs to create self socket to be able to init QMI
WDS and DFS clients, it also needs to create netlink socket to be
able to install filters on modem. It also need to access
/proc/<pid>/net .

Change-Id: Id5a7d4a9b8413e82c6b5baf6f02be4507101f1fc