passpoint-r2: define getAllMatchingWifiConfigs(List<ScanResult>) API

This API is required to support control of Passpoint configurations with
scan results on Setting UI.
Internally, previous API is merged into new API to take a list of
ScanResult Objects instead of a single ScanResult.

Bug: 119514793
Test: ./frameworks/base/wifi/tests/runtests.sh
Signed-off-by: Ecco Park <eccopark@google.com>

Change-Id: I1b9e1499081a8b005f10c249163185d0dc817b46