Add forwarded stats dump in tethering hardware offload am: 11dee200f9

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2546751

Change-Id: Ia19e19398e756f1d9bb6e68c51b920b91b5b7532
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>