Add mpc7448hpc2 maintainer information

Signed-off-by: Roy Zang <tie-fei.zang@freescale.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index cbe5c47..2e58ee4 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -420,6 +420,10 @@
 
 	linkstation	MPC8241
 
+Roy Zang <tie-fei.zang@freescale.com>
+
+	mpc7448hpc2	MPC7448
+
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 Unknown / orphaned boards: