[Passpoint] Do not use conscrypt.TrustManagerImpl for OSU

Do not use conscrypt.TrustManagerImpl for OSU server connections.
Instead, use TrustManagerFactory to get a root trust manager and
extend with WFATrustManager it.

Bug: 142148188
Test: atest OsuServerConnectionTest
Test: atest PasspointProvisionerTest
Test: Connect to OSU server
Test: Swap WFA certificates with other certificates, verify OSU
connection fails.
Change-Id: Id579c6b9ffe46e64b94d8c5ad2d285d3ff85b6b7
5 files changed
tree: 49368e89df1469d5590c97517c26f6527666e6c2
  1. apex/
  2. service/
  3. PREUPLOAD.cfg