Enable secure_element.h for doxygen

Author: Daniel Jaeckle

src/mac/secure-element.h

@@ -30,6 +30,10 @@
  *
  * \author    Johannes Bruder ( STACKFORCE )
  *
+ * \defgroup  SECUREELEMENT Secure Element API Definition
+ *
+ * \{
+ *
  */
 #ifndef __SECURE_ELEMENT_H__
 #define __SECURE_ELEMENT_H__
@@ -198,4 +202,6 @@ SecureElementStatus_t SecureElementSetJoinEui( uint8_t* joinEui );
  */
 uint8_t* SecureElementGetJoinEui( void );
 
+/*! \} defgroup SECUREELEMENT */
+
 #endif //  __SECURE_ELEMENT_H__