Add test for audio device type helper functions.

This CL added test audio device type helper functions, which expect a
single audio device type as a parameter.

Bug: 135621476
Test: atest systemaudio_tests
Change-Id: I5dac8eab93ab2251eea62b3b8d797f504bf538e4
Merged-In: I5dac8eab93ab2251eea62b3b8d797f504bf538e4
1 file changed