Do not create prebuilt ABI dumps for VNDK

Since VNDK in the main branch will not be finalized, this commit
deletes the logic that creates the prebuilt ABI dumps.

Test: ./create_reference_dumps.py -products aosp_arm64 -release next
Bug: 314010764
Change-Id: I0705c76fd41c286d846e495b65b1fe436c84e76d
2 files changed