WifiKeyStore: Always use a different alias for CA

The public keystore API's don't allow the usage of the same key alias
for CA certificates and private key/cert entries. So, switch to a
different naming scheme.

Also, this aligns the wifi enterprise network key alias naming scheme with
passpoint networks, i.e priv key/cert have alias A, CA cert have alias
A_0, A_1, etc.

Bug: 148861206
Test: Will send for regression testing.
Change-Id: I6dfd32a4b11fd531b4b63e573e4a39f2efd27965
1 file changed
tree: 758959b63e689d0e8795e163db5faeda20e9535a
  1. apex/
  2. service/
  3. PREUPLOAD.cfg