usb: dwc2: host: rework isochronous halt path

When a channel is halted because of urb dequeue during transfer
completion, no other qtds must be scheduled until halt is done.
Moreover, all in progress qtds must be given back.

Acked-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Gregory Herrero <gregory.herrero@intel.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>