added dcd_remote_wakeup() stub for all ports

src/portable/st/stm32f4/dcd_stm32f4.c

@@ -194,6 +194,11 @@ void dcd_set_config (uint8_t rhport, uint8_t config_num)
   // Nothing to do
 }
 
+void dcd_remote_wakeup(uint8_t rhport)
+{
+  (void) rhport;
+}
+
 /*------------------------------------------------------------------*/
 /* DCD Endpoint port
  *------------------------------------------------------------------*/