passpoint-r2: define getMatchingPasspointConfigsForOsuProviders API

Given a list of OSU providers, this only returns OSU providers
that already have Passpoint R2 configurations in the device.

This API is required to remove OSU provider entries that already have
the passpoint r2 profile in the device on Settings UI

Bug: 119514793
Test: ./frameworks/base/wifi/tests/runtests.sh
Test: tested with R1 AP for installing profile and R2 AP for connection
Change-Id: I111e380b3031ff268721c80501257c638f64e01a
Signed-off-by: Ecco Park <eccopark@google.com>