usb: hub: Do NOT add device if portchanged over current bit is set
USB hub should not add the usb devices if over current bit
is set in portchange. For later usb_scan_port will still return
with error and rescan and add device again.
it will generate dulplicated device and cause crash issue.
Signed-off-by: Minda Chen <minda.chen@starfivetech.com>