[QNS] Fix ConcurrentModificationException in QnsTelephonyListener

Changed to use the ConcurrentHashMap for QnsRegistrant in the
QnsTelephonyListener. With rare probability, Register() or
Unregister() can run on different threads while run in notify().

Bug: 265372291
Test: atest QualifiedNetworksServiceTests
Change-Id: Ib2ba181ab7faa4cc13e23a756450c0692a341ce8
1 file changed
tree: c2065e5aa77da423d8cb7ede0e0297f7fec5c813
  1. apex/
  2. services/
  3. .gitignore
  4. OWNERS
  5. PREUPLOAD.cfg
  6. TEST_MAPPING