Add sepolicy for dumpstate to access logs of tcpdump_logger

Bug: 183467815
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: I178aca40d94602994eef619f05a26ceb78eeff1f
1 file changed