[v2] omap2: ehci: Make Overo compile again

Overo needs the same changes as the other platforms do for the ehci changes.

Also, roll in the corresponding change from Steve Sakoman fixing the
port setup (removing the redundant GPIO setup and switching to port 2).

Signed-off-by: Olof Johansson <olof@lixom.net>
Acked-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>