Add an isEmpty convenience method to BpfMap. am: 77262cea76 am: 63585e9630

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/1560402

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I61adb34e62da8862b50a56c27dfee5cd78b705b6
tree: 8e877096d7945064c18dff218facb712a9757757
  1. framework/
  2. tests/
  3. Tethering/
  4. .gitignore
  5. OWNERS
  6. PREUPLOAD.cfg
  7. TEST_MAPPING