Enable validation of boot.scr script prior to its execution dependent
on "secureboot" flag in environment. Disable fall back option to
qspi boot in case of secure boot. Also enable "secureboot=y" flag
in environment for ARM based platforms instead of bootcmd.
Signed-off-by: NSumit Garg <sumit.garg@nxp.com>
Tested-by: NVinitha Pillai <vinitha.pillai@nxp.com>
Reviewed-by: NYork Sun <york.sun@nxp.com>