mpc52xx: add common o2dnt and o2dnt2 support and configurations

Add common code for o2dnt and o2dnt2 based boards and add different
board configuration files for O2D, O2I, O2DNT2, O2D300, O2MNT and
O3DNT boards.

Signed-off-by: Anatolij Gustschin <agust@denx.de>
diff --git a/MAINTAINERS b/MAINTAINERS
index c5a6f2f..9b20574 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -237,6 +237,15 @@
 	IPHASE4539	MPC8260
 	SCM		MPC8260
 
+Anatolij Gustschin <agust@denx.de>
+
+	O2D		MPC5200
+	O2D300		MPC5200
+	O2DNT2		MPC5200
+	O2I		MPC5200
+	O2MNT		MPC5200
+	O3DNT		MPC5200
+
 Rob Herring <rob.herring@calxeda.com>
 
 	highbank	highbank