Add forwarded stats dump in tethering hardware offload am: 11dee200f9 am: 60984730fd

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

Change-Id: I19903106f2e9dfece09a13bb8fbb45251dbf7473
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>