usb/auerswald: use wait_event_timeout()

Hi,

Please consider applying.

Description: Use wait_event_timeout() instead of custom wait-queue code. There might be a problem with returning without adding/removing to the waitqueue before wait_event_timeout() is called. I am not sure if this is a problem or not.

Signed-off-by Nishanth Aravamudan <[email protected]>