Add netlinkSocketForProto() without buffersize. am: 1d8b7cc422

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

Change-Id: I96b07e1e203516bbac40c09d1a1036a06b77f4c5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>