ARM: OMAP2+: igep0020: use display init from dss-common

Now that display information and setup is made from dss-common
there is no need to have this code in the board file.

Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Acked-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>