Filter duplicate modules in platform_compat_config_singleton

Previously, unpacking a snapshot containing a
prebuilt_platform_compat_config into a source build would cause build
failure because of duplicate ids because the singleton would collate
ids from both prebuilts (versioned and unversioned) and source.

This change filters out versioned prebuilts and only uses prebuilts
that are preferred and source modules that have not been replaced by a
prebuilt.

Bug: 182402754
Test: m nothing
Change-Id: Idacbb34444e5156370df70bf88c6e8a7e2d67890