Add java class for Ingress discard bpf map key value am: 9024892db8 am: 8d0180931b

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/28712472

Change-Id: Icef8aacedfc6c03f1cf2884cbd50ad0ee7448cd4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>