Add the netfilter generic message header to the netlink req. This is needed so the kernel won't ignore the request for invalid params. Bug: 149109043 Test: ConntrackSocketTest Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1424920/ Merged-In: I3f1d7019f1a12647b78630a412df3adf03e9e95a Change-Id: I63ca166851d6ca2c4737b263dde14c8d794a7d10