Aligned the Kubernetes setup code for s390x with the amd64 implementation (#11724)

Signed-off-by: Mujahid-Dandoti <Mujahid.Dandoti@ibm.com>
Signed-off-by: Mujahid Dandoti <70288064+dandotimujahid@users.noreply.github.com>
Co-authored-by: Lukáš Král <53821852+im-konge@users.noreply.github.com>

Author: dandotimujahid

.azure/scripts/setup-kubernetes.sh

@@ -89,16 +89,9 @@ if [ "$TEST_CLUSTER" = "minikube" ]; then
       set -ex
     fi
 
-    if [ "$ARCH" = "s390x" ]; then
+    if [[ "$ARCH" = "ppc64le" ]]; then
         git clone -b v1.9.11 --depth 1 https://github.com/kubernetes/kubernetes.git
-        sed -i 's/:1.11/:1.22.1/' kubernetes/cluster/addons/registry/images/Dockerfile
-        docker build --pull -t gcr.io/google_containers/kube-registry-proxy:0.4-${ARCH} kubernetes/cluster/addons/registry/images/
-        minikube image load ${ARCH}/registry:2.8.2 gcr.io/google_containers/kube-registry-proxy:0.4-${ARCH}
-        minikube addons enable registry --images="Registry=${ARCH}/registry:2.8.2,KubeRegistryProxy=gcr.io/google_containers/kube-registry-proxy:0.4-${ARCH}"
-        rm -rf kubernetes
-    elif [[ "$ARCH" = "ppc64le" ]]; then
-        git clone -b v1.9.11 --depth 1 https://github.com/kubernetes/kubernetes.git
-        sed -i 's/:1.11/:1.22.1/' kubernetes/cluster/addons/registry/images/Dockerfile
+	    sed -i 's/:1.11/:1.22.1/' kubernetes/cluster/addons/registry/images/Dockerfile
         docker build --pull -t gcr.io/google_containers/kube-registry-proxy:0.4-${ARCH} kubernetes/cluster/addons/registry/images/
         minikube image load ${ARCH}/registry:2.8.2 gcr.io/google_containers/kube-registry-proxy:0.4-${ARCH}
         minikube addons enable registry --images="Registry=${ARCH}/registry:2.8.0-beta.1,KubeRegistryProxy=google_containers/kube-registry-proxy:0.4-${ARCH}"