IVGCVSW-3858 Fix RefTensorHandleTests on Raspberry Pi

* Fix alignment check to use sizeof(size_t) instead of a hard-coded value

Signed-off-by: Aron Virginas-Tar <Aron.Virginas-Tar@arm.com>
Change-Id: I092c4464c6cecb2403da9b7744b68ad063ddbad1
diff --git a/src/backends/backendsCommon/test/EndToEndTestImpl.hpp b/src/backends/backendsCommon/test/EndToEndTestImpl.hpp
index 8a3e44f..040782b 100644
--- a/src/backends/backendsCommon/test/EndToEndTestImpl.hpp
+++ b/src/backends/backendsCommon/test/EndToEndTestImpl.hpp
@@ -210,14 +210,12 @@
     };
 
     // Misaligned input
-    float * misalignedInputData = inputData.data();
-    misalignedInputData++;
+    float* misalignedInputData = reinterpret_cast<float*>(reinterpret_cast<char*>(inputData.data()) + 1);
 
     std::vector<float> outputData(5);
 
     // Misaligned output
-    float * misalignedOutputData = outputData.data();
-    misalignedOutputData++;
+    float* misalignedOutputData = reinterpret_cast<float*>(reinterpret_cast<char*>(outputData.data()) + 1);
 
     InputTensors inputTensors
     {