[POWERPC] 85xx: Add second cpu to 8572 dts

The 8572 is a dual core processor, not reason not to describe both
cores in the device tree.
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

arch/powerpc/boot/dts/mpc8572ds.dts

@@ -42,6 +42,18 @@ PowerPC,8572@0 {
 			bus-frequency = <0>;
 			clock-frequency = <0>;
 		};
+
+		PowerPC,8572@1 {
+			device_type = "cpu";
+			reg = <1>;
+			d-cache-line-size = <20>;	// 32 bytes
+			i-cache-line-size = <20>;	// 32 bytes
+			d-cache-size = <8000>;		// L1, 32K
+			i-cache-size = <8000>;		// L1, 32K
+			timebase-frequency = <0>;
+			bus-frequency = <0>;
+			clock-frequency = <0>;
+		};
 	};
 
 	memory {