Support multiple library names per target.

The prior interface to make supported only a single package name per
target; although, a target might have multiple licenses each with its
own package name.

Bug: 151177513
Bug: 210912771

Test: m all dist
Test: flash; About Phone -> Legal Information -> Third-party licenses

Change-Id: I1db5fcfd4c066afd162adb4eb4177960c7a503bd