Make compat-config to generate output files too

Flag: EXEMPT host test change only
Bug: 367706429
Test: m nothing --no-skip-soong-tests
Test: `m ravenwood-runtime` and make sure out/host/linux-x86/testcases/ravenwood-runtime/ravenwood-data/
    has framework-platform-compat-config.xml and services-platform-compat-config.xml
Change-Id: I92b545c480890815cd886b8ecf50ed99ffe7eea1