netd: Enable the SO_PASSCRED socket option

Ensure that sender credentials are available when we
receive a netlink message.

This is a manual cherry-pick of
79b579c92afc08ab12c0a5788d61f2dd2934836f

Change-Id: Ia7e742c2ab2fd4149454364a8c20ab0b719196b4
1 file changed