linux-imx

LF-468-1 usb: cdns3: gadget: handle trb correctly at sg case

At current transfer complete handler, it doesn't consider
sg (scatter buffer list) case, and only handles single trb
request. In fact, we need to handle every trbs in request,
and giveback the request after all trbs are handled.

Signed-off-by: Peter Chen <peter.chen@nxp.com>