dm: core: scan reserved-memory nodes

Qualcomm platforms may have drivers that bind to reserved memory nodes
(cmd-db [1] and smem [2]) which are relevant to U-Boot. Include
/reserved-memory in dm_extended_scan() so that these will be handled
correctly.

[1]: https://www.kernel.org/doc/Documentation/devicetree/bindings/reserved-memory/qcom%2Ccmd-db.yaml
[2]: https://www.kernel.org/doc/Documentation/devicetree/bindings/soc/qcom/qcom%2Csmem.yaml

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>

drivers/core/root.c

@@ -243,7 +243,8 @@ int dm_extended_scan(bool pre_reloc_only)
 	const char * const nodes[] = {
 		"/chosen",
 		"/clocks",
-		"/firmware"
+		"/firmware",
+		"/reserved-memory",
 	};
 
 	ret = dm_scan_fdt(pre_reloc_only);