Convert merged module lib stub to api.go

Bug: 169103987
Test: m framework-updatable-stubs-module_libs_api and diff intermediates
      folder before and after.
Merged-In: I6018791ae136bc764a6e846078c6bce59bcc123b
Change-Id: I6018791ae136bc764a6e846078c6bce59bcc123b
3 files changed