Revert "Revert "apex_vndk uses vendor variants only""

This reverts commit 5df3b11f.

Reason for revert: re-land with a fix

Fix a broken soong test
Add implicit dependency (libprofile-clang-extra) to make a test pass.

Bug: n/a
Test: m
Change-Id: I0b179199bc032501354f8e24782837453781bd8c