AP_HAL_SMACCM: Semaphores fixup

libraries/AP_HAL_SMACCM/Semaphores.cpp

@@ -1,9 +1,10 @@
 
 #include "Semaphores.h"
-#include <task.h>
 
 #if CONFIG_HAL_BOARD == HAL_BOARD_SMACCM
 
+#include <task.h>
+
 using namespace SMACCM;
 
 extern const AP_HAL::HAL& hal;