usb: fix for USB_ST_STALLED status reporting in ehci_submit_async()

Checking the status field of the qTD token in the current code
do not take into acount cases where endpoint stall (halted) bit
is set together with XactErr status bit. As a result clearing
stall on an endpoint won't be done if this status bit was also
set. Check for halted bit and report USB_ST_STALLED status
if the host controller also indicates endpoit stall condition.

Signed-off-by: Anatolij Gustschin <agust@denx.de>