IVGCVSW-5300 Remove some boost::numeric_cast from armnn/backends

 * Replaced with armnn/utility/NumericCast.hpp
 * Some exclusions in reference backend
 * Excluded as requires float implementation in NumericCast.hpp

Signed-off-by: Matthew Sloyan <matthew.sloyan@arm.com>
Change-Id: I9e4e9cd502c865452128fa04415fd6f250baa855
diff --git a/src/backends/cl/ClTensorHandleFactory.cpp b/src/backends/cl/ClTensorHandleFactory.cpp
index e92913f..33995f7 100644
--- a/src/backends/cl/ClTensorHandleFactory.cpp
+++ b/src/backends/cl/ClTensorHandleFactory.cpp
@@ -7,6 +7,7 @@
 #include "ClTensorHandleFactory.hpp"
 #include "ClTensorHandle.hpp"
 
+#include <armnn/utility/NumericCast.hpp>
 #include <armnn/utility/PolymorphicDowncast.hpp>
 
 #include <arm_compute/runtime/CL/CLTensor.h>
@@ -31,7 +32,7 @@
     {
         // Arm compute indexes tensor coords in reverse order.
         unsigned int revertedIndex = subTensorShape.GetNumDimensions() - i - 1;
-        coords.set(i, boost::numeric_cast<int>(subTensorOrigin[revertedIndex]));
+        coords.set(i, armnn::numeric_cast<int>(subTensorOrigin[revertedIndex]));
     }
 
     const arm_compute::TensorShape parentShape = armcomputetensorutils::BuildArmComputeTensorShape(