[automerged blank] bpf_helpers - add declaration for bpf_ktime_get_boot_ns() 2p: f87f9a3031

Blank merge reason: Change-Id I87f344c779d89cebe9a0d09dc466966ca7fda1a6 with SHA-1 6b28299441 is in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/bpf/+/13674368

Change-Id: Ieb22cd324695f66300f37e31852576285bb0e3b7