ARM: dts: n950: add display support

Add basic panel support for the Nokia N950. It must be tweaked a
little bit later, since the panel was built into the device
upside-down. Also the first 5 and the last 5 pixels are covered
by plastic.

Signed-off-By: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Tony Lindgren <tony@atomide.com>