usbcore: warm reset USB3 port in SS.Inactive state

Some USB3.0 devices go to SS.Inactive state when hot plug to USB3 ports.
Warm reset the port to transition it to U0 state.

This patch fixes the issue that Kingston USB3.0 flash drive can not be
recognized when hot plug to USB3 port.

Signed-off-by: Andiry Xu <andiry.xu@amd.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>