DO NOT MERGE ANYWHERE: [AsyncChannel] Fix race in handling of sync result

Bug: 62866191
Bug: 63074860
Bug: 65267749
Test: wifi unit tests
Change-Id: I1d59eb8d599de9d9041e0b9b7d731363675a40c9
(cherry picked from commit 56e46134d364f7f293158979765336721a6c752c)
(cherry picked from commit 9c1d56576e01060f40de74a4c0e35e95064351be)
1 file changed