WifiApConfigStore: Use the new env method to get location of legacy file

Bug: 148660313
Test: atest com.android.server.wifi
Change-Id: I8d228de9a6e146a3e07913e84ddcd10b80e0a05e
2 files changed
tree: a892441f07b12b8b08b3510d23146645779a1057
  1. apex/
  2. service/
  3. PREUPLOAD.cfg