Add the secure boot defconfigs for QSPI boot on LS1088ARDB and LS1088AQDS platforms. Signed-off-by: Udit Agarwal <udit.agarwal@nxp.com> Signed-off-by: Vinitha Pillai-B57223 <vinitha.pillai@nxp.com> Reviewed-by: York Sun <york.sun@nxp.com>