rust/pv*: Add support for CCK update

The ultravisor supports a new secret type in `add-secret` to update
the customer communication key (CCK). Support this new secret
type (0x16).

[seiden@linux.ibm.com: Constify CCK Header struct usage]
Acked-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Reviewed-by: Steffen Eiden <seiden@linux.ibm.com>
Signed-off-by: Jakob Naucke <naucke@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>

rust/pvsecret/src/cmd/create.rs

@@ -109,6 +109,9 @@ fn build_asrcb(opt: &CreateSecretOpt) -> Result<AddSecretRequest> {
         AddSecretType::Retrievable {
             name, secret, kind, ..
         } => retrievable(name, secret, kind)?,
+        AddSecretType::UpdateCck { secret } => {
+            GuestSecret::update_cck(read_exact_file(secret, "CCK file")?)
+        }
     };
     trace!("AddSecret: {secret:x?}");