CI: remove Xen jobs

We originally added Xen builds to our CI to exercise Xen on Arm. Now
that the Yocto autobuilder has jobs that test Xen on qemuarm/qemuarm64
we no longer need the builds in meta-arm as they don't provide any more
coverage.

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Jon Mason <jon.mason@arm.com>

.gitlab-ci.yml

@@ -127,7 +127,6 @@ update-repos:
 #  TS: [none, trusted-services]
 #  TESTING: testimage
 #  SECUREDEBUG: [none, secure-debug]
-#  VIRT: [none, xen]
 
 # Validate layers are Yocto Project Compatible
 check-layers:
@@ -272,7 +271,6 @@ qemuarm64:
       - DISTRO: poky-tiny
         FIRMWARE: [u-boot, edk2]
         TESTING: testimage
-      - VIRT: xen
 
 qemuarm-secureboot:
   extends: .build
@@ -294,7 +292,6 @@ qemuarm:
         TESTING: testimage
       - DISTRO: poky-tiny
         TESTING: testimage
-      - VIRT: xen
 
 qemuarmv5:
   extends: .build

ci/xen.yml

@@ -1,16 +0,0 @@
-# yaml-language-server: $schema=https://raw.githubusercontent.com/siemens/kas/master/kas/schema-kas.json
-
-header:
-  version: 14
-  includes:
-    - ci/meta-virtualization.yml
-    - ci/poky-altcfg.yml
-
-local_conf_header:
-  meta-virt: |
-    DISTRO_FEATURES:append = " virtualization xen"
-  sshd: |
-    IMAGE_FEATURES:append = " ssh-server-openssh"
-
-target:
-  - xen-image-minimal