sgi/secure_boot: copy the prebuilt nor2 flash image

In case of automated execution, it is not possible to manually register
the secure keys into secure variable storage. So copy a prebuilt nor
flash image that is pre-loaded with these keys.

Change-Id: I5fd8607827e236374a998fb5161b843b30f1dbbb
Signed-off-by: Jagadeesh Ujja <jagadeesh.ujja@arm.com>

sgi/secure_boot.sh

@@ -73,6 +73,7 @@ while getopts "p:n:a:j:h" opt; do
 			platform=$OPTARG
 			;;
 		j)
+			automate=1
 			;;
 		n|a)
 			;;
@@ -89,6 +90,9 @@ __parse_params_validate
 platform_dir="platforms/$platform"
 pushd $platform_dir
 set -- "$@" "-f" "busybox"
+if [[ $automate == 1 ]]; then
+	wget http://files.oss.arm.com/releases/SSG-SW/prebuilts/refinfra/secure_boot/nor2_flash.img
+fi
 source ./run_model.sh
 
 # if not model failed to start, return