Remove the direct dependency on of_node_to_nid() by using dev_to_node()
instead. Any DT platform device will have its NUMA node id set when the
device is created.
With this, commit 
291717b6fbdb ("libnvdimm, of_pmem: workaround OF_NUMA=n
build error") can be reverted.
Fixes: 717197608952 ("libnvdimm: Add device-tree based driver")
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Oliver O'Halloran <oohall@gmail.com>
Cc: linux-nvdimm@lists.01.org
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
                 */
                memset(&ndr_desc, 0, sizeof(ndr_desc));
                ndr_desc.attr_groups = region_attr_groups;
-               ndr_desc.numa_node = of_node_to_nid(np);
+               ndr_desc.numa_node = dev_to_node(&pdev->dev);
                ndr_desc.res = &pdev->resource[i];
                ndr_desc.of_node = np;
                set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags);