Add compat symlinks for prebuilt_apex

When prebuilt_apex overrides/replaces other apex, the same symlinks need
to be created as well.

Bug: 143192278
Test: 1. add prebuilt_apex with vndk apex
         with overrides set as ["com.android.vndk.current"]
      2. m <prebuilt apex>
      3. check if vndk symlinks are created

Change-Id: I8ee9c981ea9c7202ccf5143b3f43e6848773cd63