phyp: Prohibit fc_host adapter for phyp driver

It's possible to support fc_host adapter for phyp driver too, but
at this stage I'd like to not allow it when I'm not that clear
how it works.

src/phyp/phyp_driver.c

@@ -2506,6 +2506,13 @@ phypBuildStoragePool(virConnectPtr conn, virStoragePoolDefPtr def)
     int exit_status = 0;
     virBuffer buf = VIR_BUFFER_INITIALIZER;
 
+    if (source.adapter.type !=
+        VIR_STORAGE_POOL_SOURCE_ADAPTER_TYPE_SCSI_HOST) {
+        virReportError(VIR_ERR_XML_ERROR, "%s",
+                       _("Only 'scsi_host' adapter is supported"));
+        goto cleanup;
+    }
+
     if (system_type == HMC)
         virBufferAsprintf(&buf, "viosvrcmd -m %s --id %d -c '",
                           managed_system, vios_id);