Break up core/Utils.h to reduce unused code being included everywhere

Makes a small difference to compile times and opens up other opportunities
to simplify code.

Change-Id: I232876910bbe4fa9719f4a0ce4a54c090faeb5ef
Signed-off-by: Matthew Bentham <Matthew.Bentham@arm.com>
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/c/VisualCompute/ComputeLibrary/+/532429
Tested-by: bsgcomp <bsgcomp@arm.com>
Reviewed-by: Pablo Tello <pablo.tello@arm.com>
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/9856
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Viet-Hoa Do <viet-hoa.do@arm.com>
Benchmark: Arm Jenkins <bsgcomp@arm.com>
diff --git a/filelist.json b/filelist.json
index 304488e..18fcaa8 100644
--- a/filelist.json
+++ b/filelist.json
@@ -27,8 +27,14 @@
     "src/core/Version.cpp",
     "src/core/helpers/SoftmaxHelpers.cpp",
     "src/core/helpers/WindowHelpers.cpp",
+    "src/core/utils/ActivationFunctionUtils.cpp",
     "src/core/utils/AssemblyUtils.cpp",
+    "src/core/utils/DataTypeUtils.cpp",
+    "src/core/utils/DataLayoutUtils.cpp",
+    "src/core/utils/InterpolationPolicyUtils.cpp",
+    "src/core/utils/FormatUtils.cpp",
     "src/core/utils/ScaleUtils.cpp",
+    "src/core/utils/StringUtils.cpp",
     "src/core/utils/helpers/fft.cpp",
     "src/core/utils/helpers/tensor_transform.cpp",
     "src/core/utils/io/FileHandler.cpp",