[RFCLAT#10] remove libnl related files am: 396b5e7b92 am: 0a977c5446 am: 573e77dfae

Original change: https://android-review.googlesource.com/c/platform/external/android-clat/+/1911235

Change-Id: Ib66ead06efd9f2a8012851df05393696191c5b4c