CI: add kas file and job for gem5-atp-arm64

Change-Id: Iee0d27c15fe00a4363ed832c06cb502c54299cd5
Signed-off-by: Adrian Herrera <adrian.herrera@arm.com>
Signed-off-by: Jon Mason <jon.mason@arm.com>

.gitlab-ci.yml

@@ -91,6 +91,9 @@ gem5-arm64:
 gem5-arm64-xen:
   extends: .build
 
+gem5-atp-arm64:
+  extends: .build
+
 generic-arm64:
   extends: .build
 

ci/gem5-atp-arm64.yml

@@ -0,0 +1,15 @@
+header:
+  version: 9
+  includes:
+    - gem5-arm64.yml
+
+repos:
+  meta-arm:
+    layers:
+      meta-atp:
+
+machine: gem5-atp-arm64
+
+target:
+  - atp-native
+  - core-image-minimal