[Passpoint] Allow multiple profiles w/identical FQDN

Allow to install multiple Passpoint profiles with identical
FQDN. The FQDN is not used as a key for profiles.
Existing Passpoint APIs that require FQDN (e.g. remove,
allow auto-join) , will apply the request to all matching
profiles with the same FQDN.

Bug: 148556276
Test: atest android.net.wifi
Test: atest com.android.server.wifi
Change-Id: Ife57367ea974ae361478ff66b2bd9ac1af0fd6ee