powerpc/85xx: bsc9131 - Correct typo in SDHC device node

BSC9131RDB doesn't have SDHC enabled. As a result of this typo,
the node was not getting disabled from the device tree which was
leading to linux hang during bootup
Signed-off-by: NHarninder Rai <harninder.rai@freescale.com>
Signed-off-by: NKumar Gala <galak@kernel.crashing.org>

arch/powerpc/boot/dts/bsc9131rdb.dtsi

@@ -126,7 +126,7 @@
 		};
 	};
 
-	sdhci@2e000 {
+	sdhc@2e000 {
 		status = "disabled";
 	};