microblaze: Fix generic DTS to ensure OF requirements

LL Temac dts nodes should contain ranges property.
It is sufficient to use empty ranges property.

Signed-off-by: Michal Simek <monstr@monstr.eu>

arch/microblaze/platform/generic/system.dts

@@ -218,6 +218,7 @@
 			#address-cells = <1>;
 			#size-cells = <1>;
 			compatible = "xlnx,compound";
+			ranges ;
 			ethernet@81c00000 {
 				compatible = "xlnx,xps-ll-temac-1.01.b", "xlnx,xps-ll-temac-1.00.a";
 				device_type = "network";
@@ -332,6 +333,7 @@
 			#address-cells = <1>;
 			#size-cells = <1>;
 			compatible = "xlnx,mpmc-4.02.a";
+			ranges ;
 			PIM3: sdma@84600180 {
 				compatible = "xlnx,ll-dma-1.00.a";
 				interrupt-parent = <&xps_intc_0>;