Bug: 264490014 Test: 1. Enable tcpdump_logger always-on function 2. Dump bugreport 3. Pull dumpstate_board.bin and chagne it to zip 4. Unzip dumpstate_board.zip and check if tcpdump files are there. Change-Id: I237e656810bf5461c2d473640bff5b0a45f75f6e