ARM: dts: omap3-gta04: add camera interface parallel port

The GTA04 has an optional OV9655 camera (for which we do
not yet have a driver upstream), but the ISP hardware
connection description in the device tree is independent
of that.

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>