hotspot2: update Passpoint configuration management APIs

Address API Councils comment to update both
WifiManager#addOrUpdatePasspointConfiguration and
WifiManager#removePasspointConfiguration to return void and throw
exception on failure instead of returning a boolean.

Bug: 35858311,35856174
Test: make -j32
Change-Id: Iac421eba7aa90e8bc3ffaf5d81210302c7557e95
Merged-In: Iac421eba7aa90e8bc3ffaf5d81210302c7557e95