racoon: allow setting options on tun interface

Fixes failure in VPN connection

avc: denied { ioctl } for pid=2870 comm="ip-up-vpn" ioctlcmd=8914
scontext=u:r:racoon:s0 tcontext=u:r:racoon:s0 tclass=udp_socket
avc: denied { ioctl } for pid=2870 comm="ip-up-vpn" ioctlcmd=8916
scontext=u:r:racoon:s0 tcontext=u:r:racoon:s0 tclass=udp_socket

Test: VPN works
Bug: 32011648
Change-Id: I28c4dc7ffbf7e35ef582176674c4e9764719a2a9