kas: Added yaml to test xen support in meta-gem5

Created yaml file "gem5-arm64-xen.yml" to build the target xen-image-minimal
for gem5, with required DISTRO_FEATURES 'xen' and 'virtualization'.

Issue-Id: SCM-2091
Signed-off-by: Nathan Dunne <Nathan.Dunne@arm.com>
Change-Id: If21d446ca36ba01657d6b48e4b3370e9d905fd1b
Signed-off-by: Jon Mason <jon.mason@arm.com>

.gitlab-ci.yml

@@ -73,6 +73,9 @@ fvp-base-arm32/external-gcc-arm32:
 gem5-arm64:
   extends: .build
 
+gem5-arm64-xen:
+  extends: .build
+
 juno:
   extends: .build
 

kas/gem5-arm64-xen.yml

@@ -0,0 +1,28 @@
+
+header:
+  version: 9
+  includes:
+    - base.yml
+    - meta-python.yml
+
+repos:
+  meta-arm:
+    layers:
+      meta-gem5:
+  meta-openembedded:
+    url: https://git.openembedded.org/meta-openembedded
+    layers:
+      meta-oe:
+      meta-filesystems:
+      meta-networking:
+  meta-virtualization:
+    url: git://git.yoctoproject.org/meta-virtualization
+
+machine: gem5-arm64
+
+local_conf_header:
+  meta-virt:
+    DISTRO_FEATURES_append = " virtualization xen"
+
+target:
+  - xen-image-minimal