[POWERPC] 85xx: Add next-level-cache property

Added next-level-cache to the L1 and a reference to the new L2 label.
This is per the ePAPR 0.94 spec.  Since we are't really dependent on this
today we aren't supporting the "legacy" l2-cache phandle that is specified
in the PPC v2.1 OF Binding spec.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/arch/powerpc/boot/dts/sbc8548.dts b/arch/powerpc/boot/dts/sbc8548.dts
index ce496fb..d252e38 100644
--- a/arch/powerpc/boot/dts/sbc8548.dts
+++ b/arch/powerpc/boot/dts/sbc8548.dts
@@ -44,6 +44,7 @@
 			timebase-frequency = <0>;	// From uboot
 			bus-frequency = <0>;
 			clock-frequency = <0>;
+			next-level-cache = <&L2>;
 		};
 	};
 
@@ -161,7 +162,7 @@
 			interrupts = <0x12 0x2>;
 		};
 
-		l2-cache-controller@20000 {
+		L2: l2-cache-controller@20000 {
 			compatible = "fsl,8548-l2-cache-controller";
 			reg = <0x20000 0x1000>;
 			cache-line-size = <0x20>;	// 32 bytes