[ROCm] Fixed memory errors in SymmetricMemory caused by repeated call…

Cherry-pick of #3403

Co-authored-by: albmalamd <albert.malewski@amd.com>

Author: rocm-repo-management-api-6[bot]

torch/csrc/distributed/c10d/symm_mem/CUDASymmetricMemoryUtils.cpp

@@ -251,12 +251,6 @@ void map_block(
       0,
       reinterpret_cast<hipMemGenericAllocationHandle_t>(handle),
       0ULL));
-  C10_CUDA_CHECK(hipMemMap(
-      *ptr,
-      size,
-      0,
-      reinterpret_cast<hipMemGenericAllocationHandle_t>(handle),
-      0ULL));
 
   hipMemAccessDesc desc;
   desc.location.type = hipMemLocationTypeDevice;