Move LORAMAC[_FALLBACK]?_VERSION macros to the header file (#1291)

* Move LORAMAC[_FALLBACK]?_VERSION macros to the header file

This trivial change makes the two version values accessible to the
application using LoRaMac-node. Being able to obtain the most recent
supported MAC version is useful in case the application needs to
generate data, e.g., for backend (TTN) provisioning.

* Remove ifndef guard surrounding LORAMAC_VERSION

The guard appears to be a leftover from a previous library version and
is no longer needed.

Author: janakj

src/mac/LoRaMac.c

@@ -48,18 +48,6 @@
 
 #include "LoRaMac.h"
 
-#ifndef LORAMAC_VERSION
-/*!
- * LoRaWAN version definition.
- */
-#define LORAMAC_VERSION                             0x01010100
-#endif
-
-/*!
- * LoRaWAN fallback version definition.
- */
-#define LORAMAC_FALLBACK_VERSION                    0x01000400
-
 /*!
  * Maximum PHY layer payload size
  */

src/mac/LoRaMac.h

@@ -83,6 +83,16 @@ extern "C"
 #include "secure-element-nvm.h"
 #include "LoRaMacClassBNvm.h"
 
+/*!
+ * LoRaWAN version definition.
+ */
+#define LORAMAC_VERSION                             0x01010100
+
+/*!
+ * LoRaWAN fallback version definition.
+ */
+#define LORAMAC_FALLBACK_VERSION                    0x01000400
+
 /*!
  * Maximum number of times the MAC layer tries to get an acknowledge.
  */