Add trove4j in prebuilts.

We're going to use the Trove collections in tools/base/perflib. Version 1.1 may
not be recent, but it's the same version that the tools/idea codebase is using.

Change-Id: I48b75c684f28f86a0a0a18dd4df3dfb2f65461e5
Merge "Add trove4j in prebuilts." into idea133