Do not build simpleperf_unit_test and simpleperf_cpu_hotplug_test for host test cases

These two tests may not support host side test yet, don't output the test binary
to testcases folder for now.

Test: make -j simpleperf_unit_test
Bug: 36820939
Change-Id: Ibffdf6a842e1cfabe8aa38dd75a79416a8bd0b23
1 file changed