libusbhost: Add usb_device_get_version()

Change-Id: If2161178e9fe94a94faf01c102ef64f2a72d093b
diff --git a/libusbhost/usbhost.c b/libusbhost/usbhost.c
index 684f401..40b8b9f 100644
--- a/libusbhost/usbhost.c
+++ b/libusbhost/usbhost.c
@@ -498,6 +498,12 @@
     return usb_device_get_string(device, desc->iProduct);
 }
 
+int usb_device_get_version(struct usb_device *device)
+{
+    struct usb_device_descriptor *desc = (struct usb_device_descriptor *)device->desc;
+    return desc->bcdUSB;
+}
+
 char* usb_device_get_serial(struct usb_device *device)
 {
     struct usb_device_descriptor *desc = (struct usb_device_descriptor *)device->desc;