Switch to the latest version of Caliper

Added an Android.mk file to core/tests/benchmarks to build the
benchmarks against caliper-api-target to ensure that they build
correctly. Changed the implementations to work with the new
version of Caliper.

Bug: 24848946
Change-Id: Ib28026816dbc5c1d54f65974f4a1abfee299c43f
9 files changed