COMPMID-2826 Comply with DCL51-CPP

Rename all header guards to be compliant with DCL51-CPP

Change-Id: I47b09375bb1b8d39d80c275ce69a3f25fb385d75
Signed-off-by: Michalis Spyrou <micspy01@e123758.cambridge.arm.com>
Reviewed-on: https://review.mlplatform.org/c/2393
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Michele Di Giorgio <michele.digiorgio@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
diff --git a/arm_compute/runtime/NEON/functions/NEPriorBoxLayer.h b/arm_compute/runtime/NEON/functions/NEPriorBoxLayer.h
index a7a2034..242460d 100644
--- a/arm_compute/runtime/NEON/functions/NEPriorBoxLayer.h
+++ b/arm_compute/runtime/NEON/functions/NEPriorBoxLayer.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018 ARM Limited.
+ * Copyright (c) 2018-2019 ARM Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -21,8 +21,8 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
-#ifndef __ARM_COMPUTE_NEPRIORBOXLAYER_H__
-#define __ARM_COMPUTE_NEPRIORBOXLAYER_H__
+#ifndef ARM_COMPUTE_NEPRIORBOXLAYER_H
+#define ARM_COMPUTE_NEPRIORBOXLAYER_H
 
 #include "arm_compute/core/NEON/kernels/NEPriorBoxLayerKernel.h"
 #include "arm_compute/core/Types.h"
@@ -56,4 +56,4 @@
     static Status validate(const ITensorInfo *input1, const ITensorInfo *input2, const ITensorInfo *output, const PriorBoxLayerInfo &info);
 };
 } // namespace arm_compute
-#endif /* __ARM_COMPUTE_NEPRIORBOXLAYER_H__ */
+#endif /* ARM_COMPUTE_NEPRIORBOXLAYER_H */