linux-imx

MLK-18656 usb: cdns3: gdaget: add hanlding of request->zero for non-EP0

In case a ZLP is required to finish the transfer, this patch implements it
by adding a request with a preallocated buffer, which is shared with all
EPs, please be noted this patch is only for non-EP0, ZLP for EP0 will be
added later.

Reported-by: Andy Tian <yang.tian@nxp.com>
Acked-by: Peter Chen <peter.chen@nxp.com>
Signed-off-by: Li Jun <jun.li@nxp.com>
(cherry picked from commit 03d202e88c5754b8b23971a03a4424efa421b6c7)