Add support for USB devices with multiple configurations and alternate interfaces

Added UsbConfiguration class, as well as accessors to UsbDevice to get configuration list
Added methods to UsbDeviceConnection to select configurations and alternate interfaces.

Also added accessors for USB descriptor name strings and fixed some memory leaks in the JNI code.

Bug: 12425052
Change-Id: Idb990f4d5c054a8cb997eb3f440f6da9f83bce05