Add a filegroup type module

1. Added a filegroup type module for the files in testdata dir, which is called
in the CtsSimpleperfTestCases module;
2. Added a symlink CtsSimpleperfTestCases_testdata to change the path of
the files in the testdata/ dir, which is required by the test
cases for the CtsSimpleperfTestCases module.

Bug: 193474582
Test: m CtsSimpleperfTestCases
Test: TreeHugger
Change-Id: Ie7775f02dea179d04c1d69b645edf65d6872d3b2
2 files changed