Add license_text for GPL 2.0 remove Apache 2.0 am: ca8ade9180 am: 1489ec5885

Original change: https://android-review.googlesource.com/c/platform/system/bpfprogs/+/1743304

Change-Id: Ib4eeb73422dfc2c3d874d4c68461216ab836210f
tree: 8167078d4d03720b90a89f0a921bb8207343d360
  1. test/
  2. Android.bp
  3. LICENSE
  4. METADATA
  5. OWNERS
  6. time_in_state.c