Embed art/libcore NOTICE files into its stubs

This simplifies the "global" stubs build rules and makes it easier to
recreate without finalizing more artifacts.

Bug: 184839599
Bug: 173186484
Test: m android_stubs_current ; unzip -l <path> | grep NOTICE
Change-Id: I3ac48cc30e66563e38768d5aef64e5253712f3cd
2 files changed