usb0 host on mcb1800 work with fullspeed mode.

use usbh_edpt_open() to correctly map ep2drv[]

src/host/usbh.h

@@ -94,6 +94,8 @@ TU_ATTR_WEAK void tuh_umount_cb(uint8_t dev_addr);
 bool usbh_init(void);
 bool usbh_control_xfer (uint8_t dev_addr, tusb_control_request_t* request, uint8_t* data);
 
+bool usbh_edpt_open(uint8_t rhport, uint8_t dev_addr, tusb_desc_endpoint_t const * ep_desc);
+
 #ifdef __cplusplus
  }
 #endif