Add netlinkSocketForProto() without buffersize. am: 1d8b7cc422

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2942526

Change-Id: I53e63903c21b3d25e203b64aac2b76d40a05ed42
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>