ARM: dts: omap3-igep00x0: Remove i2c2 node.

We can't suppose that the i2c2 pins are configured as I2C bus, these pins are
connected to expansion connectors.

Signed-off-by: Enric Balletbo i Serra <eballetbo@iseebcn.com>
Acked-by: Javier Martinez Canillas <javier@dowhile0.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>