Add files to CleanSpec.mk

This commit removes stale files from incremental builds:

* /system/etc/ld.config.txt,
* /system/etc/llndk.libraries.txt
* /system/etc/public.libraries.txt

These files are replaced by versioned ones.

Bug: 78605339
Test: Those files are removed in incremental builds
Change-Id: I7925fa45b47397829bde835ab3c479611faffa33