Add test for UsbDescriptorParser.java

The usbdescriptors_ files contain raw USB descriptors from the Google

USB-C to 3.5mm adapter, with different loads connected to the 3.5mm

jack.

usbdescriptors_nothing.bin:

 - The descriptors when the jack is disconnected.

usbdescriptors_headphones.bin:

 - The descriptors when the jack is connected to 32-ohm headphones,

   no microphone.

   The relevant output terminal is:

        bDescriptorSubtype      3 (OUTPUT_TERMINAL)

        bTerminalID            15

        wTerminalType      0x0302 Headphones

usbdescriptors_lineout.bin:

 - The descriptors when the jack is connected to a PC line-in jack.

   The relevant output terminal is:

        bDescriptorSubtype      3 (OUTPUT_TERMINAL)

        bTerminalID            15

        wTerminalType      0x0603 Line Connector

usbdescriptors_headset.bin:

 - The descriptors when a headset with microphone and low-impedance

   headphones are connected.

   The relevant input terminal is:

        bDescriptorSubtype      2 (INPUT_TERMINAL)

        bTerminalID             1

        wTerminalType      0x0201 Microphone

   The relevant output terminal is:

        bDescriptorSubtype      3 (OUTPUT_TERMINAL)

        bTerminalID            15

        wTerminalType      0x0302 Headphones