[U-Boot] [PATCH 2/3] at91_emac.c: fix 'Warning: eth device name has a space!'

[Reinhard Meyer]

Dear Andreas Bießmann,
> +	sprintf(dev->name, "at91_emac");

I would think "emac" is sufficient. That they are on an AT91 system
should be obvious to the user.

And if, somehow, in the future, MACB and AT91_EMAC get merged, we
would not need to change this again :)

Reinhard