adding subclass & protocol to class driver structure

src/common/tusb_types.h

@@ -139,6 +139,7 @@ typedef enum
   TUSB_REQ_RCPT_OTHER
 } tusb_request_recipient_t;
 
+// https://www.usb.org/defined-class-codes
 typedef enum
 {
   TUSB_CLASS_UNSPECIFIED          = 0    ,
@@ -176,6 +177,12 @@ typedef enum
   MISC_PROTOCOL_IAD = 1
 }misc_protocol_type_t;
 
+typedef enum
+{
+  APP_SUBCLASS_USBTMC = 0x03,
+  APP_SUBCLASS_DFU_RUNTIME = 0x01
+} app_subclass_type_t;
+
 typedef enum
 {
   DEVICE_CAPABILITY_WIRELESS_USB               = 0x01,