n1sdp: Reintroduce tf-l3 and scp boot tests

Commit 83ee9b348ca609e75fbc87b0b8d37372fad81d99 disabled
Platform CI tests for N1SDP because of a major change
in the boot flow.

This patch updates the scripts to adhere to the
newly introduced TBBR based boot flow, and re-enable the
boot tests.

Signed-off-by: sahil <sahil@arm.com>
Change-Id: I7cb8da4e1ff3c48784cbe7a3fabf7c4f688063af
diff --git a/script/gen_n1sdp_linux_yaml.sh b/script/gen_n1sdp_linux_yaml.sh
index e5d8602..36c7f0d 100755
--- a/script/gen_n1sdp_linux_yaml.sh
+++ b/script/gen_n1sdp_linux_yaml.sh
@@ -112,7 +112,7 @@
             steps:
               - apt -q update
               - apt -q install -y iputils-ping
-              - ping -c 5 10.6.43.131 || lava-test-raise "Device failed to reach a remote host"
+              - ping -c 5 www.arm.com || lava-test-raise "Device failed to reach a remote host"
               - hostname -I
         from: inline
         name: device-network
@@ -149,7 +149,7 @@
     os: busybox
     images:
       image:
-        url: http://files.oss.arm.com/downloads/tf-a/css/n1sdp/busybox.img
+        url: "$n1sdp_prebuilts/busybox.img"
     uniquify: false
     device: usb_storage_device
     download: