Add sepolicy for tcpdump_logger to access wlan_logs folder

tcpdump cannot be zipped into wlan logs when using tcpdump_logger
on-demand function is because tcpdump_logger doesn't have access
of wlan_logs folder.
Add related sepolicies to fix it.

Bug: 183467815
Test: 1. Set logger to wlan
      2. Enable tcpdump_logger on-demand
      3. Start logging
      4. Stop logging
      5. Pull wlan_logs
      6. Check if tcpdump.pcap is zipped into the zip file
Change-Id: Ib1b6c8cbd4512acdbe756d11bfe6f540e16c8db6
1 file changed