[Passpoint] Clear blocked providers when Wi-Fi turns off

When Wi-Fi is turned off, Passpoint manager clears the state, by
clearing the ANQP requests and cache. Also clear all blocked
providers so that these will be reevaluated once Wi-Fi is
reenabled.

Bug: 177600972
Test: atest PasspointProviderTest PasspointManagerTest
Test: test expected functionality on Passpoint setup
Change-Id: Iede9d06fdb9b62f99e0c744449fbe73c2ddbb1e9
4 files changed