Disable CFI for vendor variants of VNDK libraries

Enabling CFI changes the VNDK ABI from the frozen snapshot, so the
only solution for now is to temporarily disable CFI on all vendor
variants for the sake of compatibility.

Bug: 66301104
Test: ABI is consistent.
Change-Id: Ie7dca41e0f647808b08adede09a30f3c746e6bda