armv8: fsl-layerscape: SPL size reduction

Compile-off mp.c and libfdt.c in case of SPL build. SPL size reduces
by approx 2k.

Signed-off-by: Sumit Garg <sumit.garg@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>
1 file changed