USB: gadget: android: Support switching vendor ID when configuration changes

Based on the list of enabled USB functions, we can now switch the vendor ID
as well as the product ID.

Signed-off-by: Mike Lockwood <lockwood@android.com>
diff --git a/include/linux/usb/android_composite.h b/include/linux/usb/android_composite.h
index 62e72e3..7f90007 100644
--- a/include/linux/usb/android_composite.h
+++ b/include/linux/usb/android_composite.h
@@ -27,7 +27,12 @@
 };
 
 struct android_usb_product {
-	/* Default product ID. */
+	/* Vendor ID for this set of functions.
+	 * Default vendor_id in platform data will be used if this is zero.
+	 */
+	__u16 vendor_id;
+
+	/* Product ID for this set of functions. */
 	__u16 product_id;
 
 	/* List of function names associated with this product.