Add length option into ICMP packets am: cc32c80293

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/22963271

Change-Id: I9ebf87189e7e30e5ff904bed8ce5e944ff04c704
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>