rild: grant priv ioctl commands for udp sockets

Fixes wifi tethering.

avc: denied { ioctl } for pid=657 comm="rild" path="socket:[40758]" dev="sockfs" ino=40758 ioctlcmd=89fd scontext=u:r:rild:s0 tcontext=u:r:rild:s0 tclass=udp_socket permissive=0

Change-Id: Iace07595eb2159500050ca1a1092f59f879c011d

rild.te

@@ -4,6 +4,8 @@ type rild_exec, exec_type, file_type;
 
 init_daemon_domain(rild)
 net_domain(rild)
+allowxperm rild self:udp_socket ioctl priv_sock_ioctls;
+
 allow rild self:netlink_route_socket nlmsg_write;
 allow rild kernel:system module_request;
 allow rild self:capability { setpcap setgid setuid net_admin net_raw };