Move libz to llndk from vndk-sp for non-VNDK-enforced devices.

For non-VNDK-enforced devices, libz cannot be installed in vndk-sp
to avoid CTS test failure.
Move libz to llndk from vndk-sp for generating the namespace
configuration from ld.config.vndk_lite.txt.

Bug: 73296261
Test: run android.jni.cts test on marlin/sailfish
Change-Id: I1b8b43cd87dc8dfdd2667001ae1e50d9eaedf93d