ARM: dts: am335x-evmsk: Use drm simple-panel instead of tilcdc-panel

Move to use the new drm panel support in tilcdc together with added
"newhaven,nhd-4.3-480272ef-atxl"-panel support in drm panel-simple.

Signed-off-by: Jyri Sarha <jsarha@ti.com>
Tested-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>