api: Fix issue with SMCP CRD

$ oc apply -f manifests/maistra.io_servicemeshcontrolplanes.yaml 

W0505 13:30:59.645781 92328 warnings.go:70] apiextensions.k8s.io/v1beta1 CustomResourceDefinition is deprecated in v1.16+, unavailable in v1.22+; use apiextensions.k8s.io/v1 CustomResourceDefinition
Warning: resource customresourcedefinitions/servicemeshcontrolplanes.maistra.io is missing the kubectl.kubernetes.io/last-applied-configuration annotation which is required by oc apply. oc apply should only be used on resources created declaratively by either oc create --save-config or oc apply. The missing annotation will be patched automatically.
W0505 13:31:01.401922 92328 warnings.go:70] apiextensions.k8s.io/v1beta1 CustomResourceDefinition is deprecated in v1.16+, unavailable in v1.22+; use apiextensions.k8s.io/v1 CustomResourceDefinition
The CustomResourceDefinition "servicemeshcontrolplanes.maistra.io" is invalid: 
* metadata.annotations: Too long: must have at most 262144 bytes
* spec.versions[1].schema.openAPIV3Schema.properties[status].properties[appliedSpec].properties[gateways].properties[additionalEgress].additionalProperties.properties[service].properties[ports].items.properties[protocol].default: Forbidden: must not be set (cannot set default values in apiextensions.k8s.io/v1beta1 CRDs, must use apiextensions.k8s.io/v1)
* spec.versions[1].schema.openAPIV3Schema.properties[status].properties[appliedSpec].properties[gateways].properties[additionalIngress].additionalProperties.properties[service].properties[ports].items.properties[protocol].default: Forbidden: must not be set (cannot set default values in apiextensions.k8s.io/v1beta1 CRDs, must use apiextensions.k8s.io/v1)
... similar errors follow ...