Revert "drm/amdkfd: flush TLB after updating GPU page table"

This reverts commit 1704ac8e.

After "drm/amdgpu: flush TLB if valid PDE turns into PTE" is checked
in, this workaround is not needed.
Signed-off-by: Philip Yang <Philip.Yang@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdkfd/kfd_svm.c

@@ -1241,9 +1241,6 @@ static int svm_range_map_to_gpus(struct svm_range *prange,
 				break;
 			}
 		}
-
-		amdgpu_amdkfd_flush_gpu_tlb_pasid((struct kgd_dev *)adev,
-						  p->pasid);
 	}
 
 	return r;