pstore: Use root address-cells/size-cells as defaults for reserved-memory

u-boot adds reserve-memory node, if it's missing, with following
properties:

```
    reserved-memory {
         #address-cells = <2>;
         #size-cells = <2>;
         ranges;
    }
```

But with these default address-cells and size-cells values, pstore
isn't working on A64. Root node for A64 defines 'address-cells' and
'size-cells' as 1.

dtc complains if reserved-memory has different address-cells and
size-cells.

```
     Warning (ranges_format): /reserved-memory:ranges: empty "ranges"
     property but its #address-cells (2) differs from / (1)
```

This patch takes into account address-cells and size-cells of the root
node and uses them as values for new reserved-memory node.

Signed-off-by: Andrey Skvortsov <[email protected]>

Author: AndreySV

cmd/pstore.c

@@ -486,6 +486,8 @@ void fdt_fixup_pstore(void *blob)
 {
 	char node[32];
 	int  nodeoffset;	/* node offset from libfdt */
+	u32 addr_cells_root;
+	u32 size_cells_root;
 	u32 addr_cells;
 	u32 size_cells;
 
@@ -495,6 +497,8 @@ void fdt_fixup_pstore(void *blob)
 		log_err("fdt_path_offset() returned %s\n", fdt_strerror(nodeoffset));
 		return;
 	}
+	addr_cells_root = fdt_getprop_u32_default_node(blob, nodeoffset, 0, "#address-cells", 2);
+	size_cells_root = fdt_getprop_u32_default_node(blob, nodeoffset, 0, "#size-cells", 2);
 
 	nodeoffset = fdt_find_or_add_subnode(blob, nodeoffset, "reserved-memory");
 	if (nodeoffset < 0) {
@@ -503,8 +507,10 @@ void fdt_fixup_pstore(void *blob)
 		return;
 	}
 
-	addr_cells = fdt_getprop_u32_default_node(blob, nodeoffset, 0, "#address-cells", 2);
-	size_cells = fdt_getprop_u32_default_node(blob, nodeoffset, 0, "#size-cells", 2);
+	addr_cells = fdt_getprop_u32_default_node(blob, nodeoffset, 0,
+						  "#address-cells", addr_cells_root);
+	size_cells = fdt_getprop_u32_default_node(blob, nodeoffset, 0,
+						  "#size-cells", size_cells_root);
 	fdt_setprop_u32(blob, nodeoffset, "#address-cells", addr_cells);
 	fdt_setprop_u32(blob, nodeoffset, "#size-cells", size_cells);