apex: remove compat symlinks to vndk apex

For R+, symlinks from /system/lib to VNDK APEX are not necessary. (Note
that, symlinks to older VNDK are still necessary because older vendor
may access old locations.)

Hence, do not make symlinks for R+ VNDK APEX.

Bug: 142911355
Test: m # check /system/lib[64]/ for symlinks
        # cf should contain 28/29 symlinks but no symlinks for R
Change-Id: I852fad7edebed3e4edc03c374b3643da6b053fed