fix the CWE problem in Biometrics.

Multiple threads concurrently execute add operation and traversal operation, resulting in concurrent modification exception. We can replace the thread-unsafe ArrayList with the thread-safe CopyOnWriteArrayList.

Test: OEM monkey test
Flag: EXEMPT bugfix
Bug: 378809027
Change-Id: Id956bebe94cfd773b852292815bcee7f5d60bb77
1 file changed