Sepolicy files for wificond

This sepolicy change allows wificond to run as a deamon.

BUG=28865186
TEST=compile
TEST=compile with ag/1059605
  Add wificond to '/target/product/base.mk'
  Adb shell ps -A | grep 'wificond'

Change-Id: If1e4a8542ac03e8ae42371d75aa46b90c3d8545d