Define a new usb_bus_start_enum() routine that's available with OTG.
It starts immediate enumeration (port reset) and makes khubd wake up
later.  Non-OTG code could start to use this, given some attention to
HC-specific reset timing issues.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>