Update simpleperf_cpu_hotplug_test to really work host-side

simpleperf_cpu_hotplug_test is marked host_supported:true but use
a AndroidTest.xml config that can only work for device.

Deleting the explict config to rely on the auto-gen ones.
Adding unit_tests:true to run in presubmit

Change-Id: Iddd6962cce89ed170e2483fe5b0c8710a4cd4beb
Test: presubmit, atest simpleperf_cpu_hotplug_test --host
Bug: 179092189
2 files changed