We need the ability to set file permissions, create files, write
files, chown files.

Test: integration tests that start/stop hostapd and write its config
      file via wificond pass without SELinux denials.
Bug: 30040724

Change-Id: Iee15fb36a6a4a89009d4b45281060379d70cd53c
(cherry picked from commit f83da142)