Move llndk.libraries.txt definition

Previously llndk.libraries.txt definition was located in VNDK along with
other vndk related libraries.txt files. As of VNDK deprecation, all
other VNDK libraries.txt files are being removed, and there is no need
to keep llndk.libraries.txt whtin the VNDK project, as LLNDK is not
VNDK. This change moves definition of llndk.libraries.txt into system
core project, to keep with other files installed in /system/etc.

Bug: 328994089
Test: AOSP CF build succeeded
Change-Id: I1535ebbab514ecf81a044c0e5ac4472f964f4312