[POWERPC] 52xx: unbreak lite5200 dts (_pic vs. -pic)

Unbreak lite5200 dts, which were broken by
5c1992f83304cf2d56934dd6c06709b96e1b0c81

Signed-off-by: Domen Puncer <domen.puncer@telargo.com>
Acked-by: Sylvain Munaut <tnt@246tNt.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

arch/powerpc/boot/dts/lite5200.dts

@@ -67,7 +67,7 @@
 			interrupt-controller;
 			#interrupt-cells = <3>;
 			device_type = "interrupt-controller";
-			compatible = "mpc5200_pic";
+			compatible = "mpc5200-pic";
 			reg = <500 80>;
 			built-in;
 		};

arch/powerpc/boot/dts/lite5200b.dts

@@ -67,7 +67,7 @@
 			interrupt-controller;
 			#interrupt-cells = <3>;
 			device_type = "interrupt-controller";
-			compatible = "mpc5200b-pic\0mpc5200_pic";
+			compatible = "mpc5200b-pic\0mpc5200-pic";
 			reg = <500 80>;
 			built-in;
 		};