Align kernel/operator header layout

- Redirect validate documentation to configure
- Align header names
- Align class layout

Signed-off-by: Georgios Pinitas <georgios.pinitas@arm.com>
Change-Id: Ia40f67383826a66e9f9a33745d66805551e31a3a
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/5897
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Michele Di Giorgio <michele.digiorgio@arm.com>
diff --git a/src/core/cpu/kernels/CpuAddKernel.h b/src/core/cpu/kernels/CpuAddKernel.h
index 3ebaa46..717d013 100644
--- a/src/core/cpu/kernels/CpuAddKernel.h
+++ b/src/core/cpu/kernels/CpuAddKernel.h
@@ -21,8 +21,8 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
-#ifndef ARM_COMPUTE_CPUADDKERNEL_H
-#define ARM_COMPUTE_CPUADDKERNEL_H
+#ifndef ARM_COMPUTE_CPU_ADD_KERNEL_H
+#define ARM_COMPUTE_CPU_ADD_KERNEL_H
 
 #include "src/core/common/Macros.h"
 #include "src/core/cpu/ICpuKernel.h"
@@ -84,4 +84,4 @@
 } // namespace kernels
 } // namespace cpu
 } // namespace arm_compute
-#endif /*ARM_COMPUTE_CPUADDKERNEL_H */
+#endif /* ARM_COMPUTE_CPU_ADD_KERNEL_H */