ARM: dts: imx6qdl-icore-rqs: Sync usdhc4 node from Linux

usdhc4 node need to update pinctrl, bus-width and non-removable
properties, sync the same from Linux.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>