MAINTAINERS: Add entry for 'inka4x0' board.

Signed-off-by: Detlev Zundel <dzu@denx.de>

MAINTAINERS

@@ -452,6 +452,10 @@ John Zhan <zhanz@sinovee.com>
 
 	svm_sc8xx	MPC8xx
 
+Detlev Zundel <dzu@denx.de>
+
+	inka4x0		MPC5200
+
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 Unknown / orphaned boards: