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/boards.cfg b/boards.cfg
index fdb84ad..eda49c6 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -482,6 +482,16 @@
 cpci5200                     powerpc     mpc5xxx     -                   esd
 mecp5200                     powerpc     mpc5xxx     -                   esd
 pf5200                       powerpc     mpc5xxx     -                   esd
+O2D                          powerpc     mpc5xxx     o2dnt2              ifm            -           o2d
+O2D300                       powerpc     mpc5xxx     o2dnt2              ifm            -           o2d300
+O2DNT2                       powerpc     mpc5xxx     o2dnt2              ifm            -           o2dnt2
+O2DNT2_RAMBOOT               powerpc     mpc5xxx     o2dnt2              ifm            -           o2dnt2:SYS_TEXT_BASE=0x00100000
+O2I                          powerpc     mpc5xxx     o2dnt2              ifm            -           o2i
+O2MNT                        powerpc     mpc5xxx     o2dnt2              ifm            -           o2mnt
+O2MNT_O2M110                 powerpc     mpc5xxx     o2dnt2              ifm            -           o2mnt:IFM_SENSOR_TYPE="O2M110"
+O2MNT_O2M112                 powerpc     mpc5xxx     o2dnt2              ifm            -           o2mnt:IFM_SENSOR_TYPE="O2M112"
+O2MNT_O2M113                 powerpc     mpc5xxx     o2dnt2              ifm            -           o2mnt:IFM_SENSOR_TYPE="O2M113"
+O3DNT                        powerpc     mpc5xxx     o2dnt2              ifm            -           o3dnt
 digsy_mtc                    powerpc     mpc5xxx     digsy_mtc           intercontrol
 digsy_mtc_RAMBOOT            powerpc     mpc5xxx     digsy_mtc           intercontrol   -           digsy_mtc:SYS_TEXT_BASE=0x00100000
 digsy_mtc_rev5               powerpc     mpc5xxx     digsy_mtc           intercontrol   -           digsy_mtc:DIGSY_REV5