bpf programs: switch from integers to #define'd bpfloader versions am: b6efc7f168 am: c451e57fe0

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/18992474

Change-Id: Icd7bb58f57a4fc057c94723c46d77936c570fec7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>