- addd p_qtd_list_tail to qhd structure for easy queue TD

- move control_request from ehci_data to usbh_device_info_pool
- add test for bulk transfer double (2 consecutive xfers)
- use table (array) structure for class driver, currently included
- refractor extract to function insert_qtd_to_qhd
+ init function
+ install_subtask
--> all class driver function must be declared with WEAK

tests/test/host/ehci/test_ehci_pipe_xfer.c

@@ -162,7 +162,7 @@ void test_control_addr0_xfer_get_check_qhd_qtd_mapping(void)
   TEST_ASSERT_EQUAL_HEX( p_status , p_data->next.address );
   TEST_ASSERT_TRUE( p_status->next.terminate );
 
-  verify_qtd(p_setup, &ehci_data.control_request[0], 8);
+  verify_qtd(p_setup, &usbh_device_info_pool[0].control_request, 8);
 }
 
 
@@ -181,7 +181,7 @@ void test_control_xfer_get(void)
   TEST_ASSERT_TRUE( p_status->next.terminate );
 
   //------------- SETUP -------------//
-  uint8_t* p_request = (uint8_t *) &ehci_data.control_request[dev_addr];
+  uint8_t* p_request = (uint8_t *) &usbh_device_info_pool[dev_addr].control_request;
   verify_qtd(p_setup, p_request, 8);
 
   TEST_ASSERT_EQUAL_MEMORY(&request_get_dev_desc, p_request, sizeof(tusb_std_request_t));