goldfish_setup: grant ifconfig priv_sock_ioctls

The goldfish_setup shell script needs the ability to set the interface
address via ifconfig. This requires SIOCSIFADDR plus other ioctl
permissions, therefore allow the set of priv_sock_ioctls permissions.

Addresses the following denial that stops internet access via browser:
avc: denied { ioctl } for pid=712 comm="ifconfig" path="socket:[1825]"
dev="sockfs" ino=1825 ioctlcmd=8916 scontext=u:r:goldfish_setup:s0
tcontext=u:r:goldfish_setup:s0 tclass=udp_socket permissive=0

Test: With update can access internet via browser.

Change-Id: I77a52c0b72bb0ebe9451f45c346a399c1f61672d
Signed-off-by: Richard Haines <richard_c_haines@btinternet.com>