Addresses PR comments

Signed-off-by: Esteban Papp <81431996+amznestebanpapp@users.noreply.github.com>

Code/Framework/AzCore/Tests/Memory/AllocatorBenchmarks.cpp

@@ -155,11 +155,9 @@ namespace Benchmark
         }
 
     private:
-        static size_t s_numAllocatedBytes;
+         inline static size_t s_numAllocatedBytes = 0;
     };
 
-    size_t TestAllocatorWrapper<RawMallocAllocator>::s_numAllocatedBytes = 0;
-
     // Some allocator are not fully declared, those we simply setup from the schema
     class MallocSchemaAllocator : public AZ::SimpleSchemaAllocator<AZ::MallocSchema>
     {