[Passpoint] Remove R2 broadcasts

Remove R2 broadcasts for Icon, deauth imminent and subscription
remediation. These broadcasts are not used and not necessary,
and also leaked the Passpoint AP BSSID without location
permission.

Bug: 157748906
Test: atest PasspointManagerTest
Change-Id: I25aba4c7a39150e9df483890f575d3e3767723be
2 files changed