Temporarily link Vendor APEX with vendor libbinder when VNDK deprecated

As VNDK is in deprecation, any Vendor APEX which used use_vndk_as_stable
should copy former-VNDK libraries into its own APEX. However, libbinder
is not allowed to create APEX variant, so it should use libbinder_ndk
instead. This change is to temporalily allow Vendor APEX modules link
with libbinder in /vendor/lib, while any Vendor APEX modules using
libbinder transit into libbinder_ndk.

Bug: 296491928
Test: Cheetah build and boot succeeded
Change-Id: I40beb255bab658b75685e78f48e14520058616d6