OMAP3: igep00x0: rename config file to omap3_igep00x0.h

OMAP3: igep00x0: rename config file to omap3_igep00x0.h

There seems to be a naming convention for the configuration
files for boards using the same SoC family. This makes
easier to do changes that affect different boards based
on the same SoC.

Since the IGEPv2 board and the IGEP COM Module use a TI
OMAP35xx/DM37xx processor, is better to rename its board
config to use this naming scheme.

Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Acked-by: Enric Balletbo i Serra <eballetbo@iseebcn.com>