ARM: dts: omap3-devkit8000: add LCD panels

Devkit8000 was sold with a 4.3" LCD or 7.0" or without. This patch
creates one dts file per bundle.

Signed-off-by: Anthoine Bourgeois <anthoine.bourgeois@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>