move waitForProgsLoaded() to header file am: cdf85a3148 am: 9118307262

Original change: https://android-review.googlesource.com/c/platform/system/bpf/+/1557259

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ifa8005179bec531107c13b669c38887c7ce62460
tree: 19373c21412695505cb707bd296d6e3cbc1aad33
  1. bpfloader/
  2. libbpf_android/
  3. progs/
  4. Android.bp
  5. NOTICE
  6. OWNERS
  7. PREUPLOAD.cfg