uboot-imx

armv8: fsl-layerscape: Fix final MMU table for QSPI and IFC

For QSPI and IFC addresses execution shouldn't be allowed
when u-boot running from DDR. Revise the MMU final table
to enforce execute-never bits.

Signed-off-by: Suresh Gupta <suresh.gupta@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>