wifi: convert multi-type configs to legacy configs

Multi-type support is for internal service and no
API to retrieve the whole list. Convert multi-type configuration to
single-type legacy configs, so external consumers could handle wifi
configurations as usual.

Bug: 186066324
Test: atest FrameworksWifiTests
Change-Id: I3d382a62db5464642bdc4be064db802075c1a75e
6 files changed