Droidfood only: Move private APIs to dark greylist by default

In order to tune the API lists, we initialize the light greylist with
APIs we know are used by popular apps. All the other private APIs are
moved into dark greylist. Light greylist will be set to not warn at
all, while dark greylist will produce warnings. This will allow us to
collect logs and tune the lists without breaking all of our dogfooders.

Bug: 64382372
Bug: 72793280
Test: make
Change-Id: Ice6c487eeca8900e6a70abe1b87e8c211ef1066e