ls1088ardb: Add SD Secure boot target support

Signed-off-by: Udit Agarwal <udit.agarwal@nxp.com>
Signed-off-by: Sumit Garg <sumit.garg@nxp.com>
[YS: run moveconfig.py -s]
Reviewed-by: York Sun <york.sun@nxp.com>