[POWERPC] Fix typo in Ebony default DTS

Signed-off-by: Li Yang <leoli@freescale.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/boot/dts/ebony.dts

@@ -31,8 +31,8 @@
 			reg = <0>;
 			clock-frequency = <0>; // Filled in by zImage
 			timebase-frequency = <0>; // Filled in by zImage
-			i-cache-line-size = <32>;
-			d-cache-line-size = <32>;
+			i-cache-line-size = <20>;
+			d-cache-line-size = <20>;
 			i-cache-size = <8000>; /* 32 kB */
 			d-cache-size = <8000>; /* 32 kB */
 			dcr-controller;