usb: misc: onboard_usb_hub: Remove duplicated power_on delay

onboard_hub_power_on() already ensures the reset pulse width delay, so
there is no need to wait right after requesting GPIO as well.

Fixes: 40758e49 ("usb: misc: onboard_usb_hub: Add reset-gpio support")
Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Link: https://lore.kernel.org/r/20220728064937.917935-1-alexander.stein@ew.tq-group.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>