Since the platform device and module name differ, this needs a
MODULE_ALIAS to support coldplug configurations.

Alias the "ohci-hcd" module as "ohci" so that coldplug works
when this driver module is being dynamically linked.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Tony Lindgren <tony@atomide.com>