Use ArraySet#add() instead of ArraySet#append()

ArraySet#append() is a hidden API which is not accessible for
mainline module, use public one - ArraySet#add() instead.

Bug: 170598012
Test: atest FrameworksNetTests
Change-Id: I0742e2ec7aff008141b1de6d10eeca2910df71b1
1 file changed
tree: f85904d84c279c0c2be7c75eb300d74a80070e1a
  1. framework/
  2. service/
  3. OWNERS