FHSS: Update Beacon synch info in critical state

(cherry picked from commit 89de58e43616877e59153207be852b9147d67f67)

Author: Jarkko Paso

source/Service_Libs/fhss/fhss_beacon_tasklet.c

@@ -26,6 +26,7 @@
 #include "fhss.h"
 #include "fhss_beacon.h"
 #include "fhss_statistics.h"
+#include "platform/arm_hal_interrupt.h"
 
 #include <string.h> // memset
 
@@ -128,8 +129,9 @@ static void fhss_beacon_tasklet_func(arm_event_s* event)
 void fhss_beacon_build(fhss_structure_t *fhss_structure, uint8_t* dest)
 {
     fhss_synchronization_beacon_payload_s temp_payload;
-
+    platform_enter_critical();
     fhss_beacon_update_payload(fhss_structure, &temp_payload);
+    platform_exit_critical();
     fhss_beacon_encode_raw(dest, &temp_payload);
 }