Remove not needed assignment operator

Related-To: NEO-4672
Change-Id: I5351b799b87dc79689d865034f4a216aae1d6b8b
Signed-off-by: Mateusz Jablonski <mateusz.jablonski@intel.com>

shared/source/memory_manager/unified_memory_manager.h

@@ -37,6 +37,7 @@ struct SvmAllocationData {
             }
         }
     }
+    SvmAllocationData &operator=(const SvmAllocationData &) = delete;
     GraphicsAllocation *cpuAllocation = nullptr;
     MultiGraphicsAllocation gpuAllocations;
     size_t size = 0;