Add netlinkSocketForProto() without buffersize. am: 1d8b7cc422 am: 5d65631bf0

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

Change-Id: Ib3a245adbc65a4e17fa537a341796c94c6f6a1e0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>