bpf_headers: add kernel bitness utility functions to KernelUtils am: 3fafb0cc72

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/libs/net/+/23391170

Change-Id: I5a73be6ae56a706114ebacacd1e1b60e96ba5ae3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>