Retain back-compatibility for arm_compute/core/Types.h

* Some symbols have been moved from core/Types.h. This patch retains
  back compatibility so that the user can still include this header
  for those symbols

* A new header core/CoreTypes.h is created to avoid circular dependency.
  This header includes essential small types that are used across
  functions

* Move all function info types into function_info folder for easier
  tracking

Resolves COMPMID-6330
Related to https://review.mlplatform.org/c/ml/ComputeLibrary/+/9757

Signed-off-by: SiCong Li <sicong.li@arm.com>
Change-Id: I4739175c2d4d184a9bc8e28b881b497fab03ca60
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/9979
Reviewed-by: Jakub Sujak <jakub.sujak@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
diff --git a/src/gpu/cl/operators/ClMatMul.h b/src/gpu/cl/operators/ClMatMul.h
index 9dce528..abbb752 100644
--- a/src/gpu/cl/operators/ClMatMul.h
+++ b/src/gpu/cl/operators/ClMatMul.h
@@ -24,8 +24,8 @@
 #ifndef ACL_SRC_GPU_CL_OPERATORS_CLMATMUL
 #define ACL_SRC_GPU_CL_OPERATORS_CLMATMUL
 
-#include "arm_compute/core/ActivationLayerInfo.h"
-#include "arm_compute/core/MatMulInfo.h"
+#include "arm_compute/function_info/ActivationLayerInfo.h"
+#include "arm_compute/function_info/MatMulInfo.h"
 #include "src/gpu/cl/IClOperator.h"
 #include "src/gpu/cl/kernels/ClMatMulLowpNativeKernel.h"
 #include "src/gpu/cl/kernels/ClMatMulNativeKernel.h"