USB: Fix connected device switch to Inactive state.

A USB 3.0 device can transition to the Inactive state if a U1 or U2
exit
transition fails.  The current code in hub_events simply issues a
warm
reset, but does not call any pre-reset or post-reset driver methods
(or
unbind/rebind drivers without them).  Therefore the drivers won't
know
their device has just been reset.

hub_events should instead call
usb_reset_device.  This means
hub_port_reset now needs to figure out
whether it should issue a warm
reset or a hot reset.

Remove the FIXME
note about needing disconnect() for a NOTATTACHED
device.  This patch
fixes that.

Signed-off-by: Sarah Sharp
<sarah.a.sharp@linux.intel.com>
Acked-by: Alan Stern
<stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman
<gregkh@linuxfoundation.org>

idea is taken here -
https://github.com/varunchitre15/thunderzap_xl/commit/fa6e7507d780110b4157d945980378a4c986cd9a