Copy hidden API blacklist/dark greylist into build folder

This change is meant for ART buildbots which build against a pinned
commit of the framework and thus do not have the commit which
introduced hidden API lists. Normal builds will now copy the blacklist
and dark greylist into the build folder first, and then generate the
light greylist as usual. If a buildbot does not have the framework
changes, it can create dummy API lists in the build folder before
starting the build and avoid the issue.

Test: make
Bug: 64382372
Change-Id: Ib6e53a45bcc917abb4ba67fdcbf01d4a19c2d56f