SMDK6400: Add MAINTAINERS entry

Signed-off-by: Zhong Hongbo <bocui107@gmail.com>

MAINTAINERS

@@ -959,6 +959,10 @@ Vladimir Zapolskiy <vz@mleia.com>
 
 	devkit3250	lpc32xx
 
+Zhong Hongbo <bocui107@gmail.com>
+
+	SMDK6400	ARM1176 (S3C6400 SoC)
+
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 Unknown / orphaned boards:
@@ -971,7 +975,6 @@ Unknown / orphaned boards:
 
 	imx31_phycore_eet i.MX31  Guennadi Liakhovetski <g.liakhovetski@gmx.de> / resigned
 	mx31ads		  i.MX31  Guennadi Liakhovetski <g.liakhovetski@gmx.de> / resigned
-	SMDK6400	  S3C6400 Guennadi Liakhovetski <g.liakhovetski@gmx.de> / resigned
 
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 # x86 Systems:								#