ARM: dts: overo: Add support for 3.5'' LCD output

Alto35 expansion board has a ZIF connector for a 3.5'' LCD.
Add a common include file for this configuration, and use it
on Alto35.

Signed-off-by: Florian Vaussard <florian.vaussard@epfl.ch>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>