[WifiInstaller] Remove Passpoint profile before installing

Due to a change in the addOrUpdatePasspointProfile behavior, Wi-Fi
cert installer needs to delete existing Passpoint profile before
installing a new one with the same FQDN.

Bug: 156405566
Test: Install a new cert, verify correctness.
Change-Id: Ib258750f546f81cdf1081bbff5c0f1c4c23fd070
1 file changed