Add test for UsbDescriptorParser.java

Tests with descriptors from USB-C to 3.5mm adapter in four cases:
 - line level load connected, no microphone
 - low impedance load with microphone
 - low impedance load without microphone
 - no load attached.

Test: Ran tests without fix for bug 73813676, failed.
Ran tests with fix, all passed.

Change-Id: I067a15a122996e80c70bf287c6982611b6deee01