Merge pull request #8442 from evva-sfw/bug/missing-define

Add missing define in drivers/SerialWireOutput.h

Author: Cruz Monrreal

drivers/SerialWireOutput.h

@@ -14,6 +14,9 @@
  * limitations under the License.
  */
 
+#ifndef MBED_SERIALWIREOUTPUT_H
+#define MBED_SERIALWIREOUTPUT_H
+
 #if defined(DEVICE_ITM)
 
 #include "hal/itm_api.h"
@@ -70,4 +73,6 @@ class SerialWireOutput : public FileHandle {
 
 } // namespace mbed
 
-#endif
+#endif // DEVICE_ITM
+
+#endif // MBED_SERIALWIREOUTPUT_H