complete remove dcd_set_config(), fix unit test

src/device/dcd.h

@@ -100,9 +100,6 @@ void dcd_int_disable(uint8_t rhport);
 // Receive Set Address request, mcu port must also include status IN response
 void dcd_set_address(uint8_t rhport, uint8_t dev_addr);
 
-// Receive Set Configure request
-void dcd_set_config (uint8_t rhport, uint8_t config_num);
-
 // Wake up host
 void dcd_remote_wakeup(uint8_t rhport);