usb: xhci-mtk: add a member @speed in mu3h_sch_ep_info struct

This is used to drop parameter @udev for some functions,
meanwhile remove some unused @udev parameter.

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Link: https://lore.kernel.org/r/cda0833e44d6027cc8fdee1e29ce2b5b2a6ac03d.1615170625.git.chunfeng.yun@mediatek.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>