improve host configuration parsing

- remove driver class code binding
- fully support IAD
- auto calculate total length for interface descriptor for driver

src/common/tusb_common.h

@@ -83,6 +83,9 @@ bool tu_edpt_validate(tusb_desc_endpoint_t const * desc_ep, tusb_speed_t speed);
 // Bind all endpoint of a interface descriptor to class driver
 void tu_edpt_bind_driver(uint8_t ep2drv[][2], tusb_desc_interface_t const* p_desc, uint16_t desc_len, uint8_t driver_id);
 
+// Calculate total length of n interfaces (depending on IAD)
+uint16_t tu_desc_get_interface_total_len(tusb_desc_interface_t const* desc_itf, uint8_t itf_count, uint16_t max_len);
+
 //--------------------------------------------------------------------+
 // Internal Inline Functions
 //--------------------------------------------------------------------+