UsbAccessory: Add URI string, replace type string with description

This is a first step toward adding USB accessory URI support

BUG: 4073248

Modified USB accessory matching logic to look only at manufacturer, model and version
(description and URI are not considered when matching apps to accessories)

Also added test for USB accessory protocol version to accessorytest

BUG: 4080288

Change-Id: I992a3433c74efa7a7db37bf030f02c1f0c92f9e2
Signed-off-by: Mike Lockwood <lockwood@android.com>