Add include guard in headers files (#8108)

Signed-off-by: Sugnan Prabhu S <sugnan.prabhu.s@intel.com>

src/modules/commander/arm_auth.h

@@ -31,6 +31,8 @@
  *
  ****************************************************************************/
 
+#pragma once
+
 #include <stdint.h>
 
 #include <drivers/drv_hrt.h>

src/modules/commander/calibration_routines.h

@@ -34,6 +34,8 @@
 /// @file calibration_routines.h
 ///	@authot Don Gagne <don@thegagnes.com>
 
+#pragma once
+
 /**
  * Least-squares fit of a sphere to a set of points.
  *