[NETD-BPF#10] Add WaitForProgsLoaded.h

Move waitForProgsLoaded() from libbpf_android.h to a single header file.
A transitional commit of separating headers, utilities from bfploader.

Bug: 202086915
Test: build; flash; cd system/netd; atest
Change-Id: Ief1bcd09e973f952c29859a7a8fba92c8626e32d
2 files changed
tree: 0a092a05916d23f3deeaeb998e4ab1c0bcb980d9
  1. bpfloader/
  2. libbpf_android/
  3. progs/
  4. Android.bp
  5. NOTICE
  6. OWNERS
  7. OWNERS_bpf
  8. PREUPLOAD.cfg