WifiConfigStoreEncryptionUtil: Use 256 bit secret key

Bug: 140485110
Test: Manual verification
- Store a PSK network config on older build
- Upgrade to build with this CL
- adb shell settings put global niap_mode 1
- Ensured that the psk was read correctly on upgrade
- Ensured that the psk was encrypted when stored on disk after upgrade

Change-Id: I3b98c2c83b8aa6280c793068e5c275543ba69e8b
1 file changed
tree: ac1deead22698b5d882d3ac6858dbf4ba789ce16
  1. service/
  2. PREUPLOAD.cfg