remove p and z

Author: AjayJagan

.tekton/modelmesh-runtime-adapter-multi-arch-poc-push.yaml

@@ -28,8 +28,6 @@ spec:
     value:
     - linux/x86_64
     - linux/arm64
-    - linux/s390x
-    - linux/ppc64le
   - name: dockerfile
     value: Dockerfile
   - name: path-context