USB: UHCI: notify usbcore about port resumes

This patch (as1651) adds calls to the new
usb_hcd_{start,end}_port_resume() functions to uhci-hcd.  Now UHCI
root hubs won't be runtime suspended while they are sending a resume
signal to one of their ports.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>