This patch removes redundant pointer to struct usb_endpoint_descriptor which
were missed in commit 79149b8b:

 usb: gadget: Update fsl_udc_core to use usb_endpoint_descriptor inside the
 struct usb_ep

Due to clock framework regressions, this patch is only compile tested!
Signed-off-by: NChristoph Fritz <chf.fritz@googlemail.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>