powerpc/mpc5200: add dts files for ifm camera machines

Add common o2d dtsi file to reuse it for other configurations.
Add machine compatible string to mpc5200 simple platform file.
Add dts files for O2D, O2I, O2MNT, O2DNT2, O2D300 and O3DNT boards.

Signed-off-by: Anatolij Gustschin <agust@denx.de>