bpf_headers: add kernel bitness utility functions to KernelUtils am: 3fafb0cc72 am: b1019329e9

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

Change-Id: Id689e69e8c43715333f2b17b73fe2ada2737ad2b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>