Add systemaudio_tests.

The test is moving from frameworks/av/services/audiopolicy/tests

Bug: 135621476
Test: atest systemaudio_tests
Change-Id: I85a794d1d8ce0994dff810d937d5ce7eaa15141f
Merged-In: I85a794d1d8ce0994dff810d937d5ce7eaa15141f
3 files changed