Relocate llndk.libraries.txt into system

llndk.libraries.txt file is currently located within the VNDK APEX.
However, this file is still required even if VNDK APEX is deprecated.
This change removes llndk.libraries.txt from VNDK APEX, so it can be
installed within the system image.

Bug: 290160925
Test: aosp_cf build succeeded with llndk.libraries.txt in the system
image

Change-Id: I09a0a43babaa58ff16fc04ea71ab41ab68b54b70