Add an isEmpty convenience method to BpfMap. am: 77262cea76 am: 63585e9630 am: bb226600c1

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

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I4a5d933ebce3974a10a8c859b964e3f649bdd7c1
tree: e88bd6afc03924d63356f9e58ca503fb778bf09e
  1. framework/
  2. tests/
  3. Tethering/
  4. .gitignore
  5. OWNERS
  6. PREUPLOAD.cfg
  7. TEST_MAPPING