Let Release_aidl_use_unfrozen add vintf_fragments

The product_config variable can be used to add different
vintf_fragments.

Ignore-AOSP-First: this is required for vFRC finalization and needs to be submitted ASAP. This can be cherry-picked to aosp after finalization.

Test: launch_cvd && atest hal_implementation_test
Test: lunch `next` && atest vts_treble_vintf_framework_test
Bug: 279809333
Change-Id: Ied17ad4c4564a5d97f93001734fba7cc6648bbc2