start bpfloader asynchronously am: 838b81de8f am: b45a26898b am: 1e3151483f

Original change: https://android-review.googlesource.com/c/platform/system/bpf/+/1347789

Change-Id: Icec88f88919398997f05c9a97ea650c0c075dca4
tree: d1d8a149f50e67b936da0ebd33ba0882f79b9668
  1. bpfloader/
  2. libbpf_android/
  3. progs/
  4. Android.bp
  5. NOTICE
  6. OWNERS
  7. PREUPLOAD.cfg