added disconnect for spresense

src/portable/sony/cxd56/dcd_cxd56.c

@@ -201,19 +201,17 @@ void dcd_remote_wakeup(uint8_t rhport)
   DEV_WAKEUP(usbdev);
 }
 
-#if 0 // TODO implement for Spresense
 void dcd_connect(uint8_t rhport)
 {
   (void) rhport;
-//  DEV_CONNECT(usbdev);
+  DEV_CONNECT(usbdev);
 }
 
 void dcd_disconnect(uint8_t rhport)
 {
   (void) rhport;
-//  DEV_DISCONNECT(usbdev);
+  DEV_DISCONNECT(usbdev);
 }
-#endif
 
 //--------------------------------------------------------------------+
 // Endpoint API