[NUCLEO_F030R8] Fix issue with last changes in error.h

Author: bcostm

libraries/mbed/targets/hal/TARGET_STM/TARGET_NUCLEO_F030R8/pinmap.c

@@ -28,6 +28,7 @@
  *******************************************************************************
  */
 #include "pinmap.h"
+#include "PortNames.h"
 #include "error.h"
 
 // Enable GPIO clock and return GPIO base address