Read public.libraries-<company>.txt from product/etc/

Even in the case of unbundled product partition, extending the public
libraries must follow the existing policy. Read
public.libraries-<company>.txt from the product partition instead of
public.libraries.txt in any cases.

Bug: 186055799
Test: pm list libraries
      atest libnativeloader_test
Change-Id: I1c9fd182fa902cf750a9644bf9a3c1ffcfa01340
1 file changed