tpm: Return QMP error when TPM is disabled in build

When the management layer queries a binary built using --disable-tpm
for TPM devices, it gets confused by getting empty responses:

  { "execute": "query-tpm" }
  {
      "return": [
      ]
  }
  { "execute": "query-tpm-types" }
  {
      "return": [
      ]
  }
  { "execute": "query-tpm-models" }
  {
      "return": [
      ]
  }

To make it clearer by returning an error:
- Make the TPM QAPI schema conditional
  All of tpm.json is now 'if': 'defined(CONFIG_TPM)'.
- Adapt the HMP command
- Remove stubs which became unnecessary

The management layer now gets a 'CommandNotFound' error:

  { "execute": "query-tpm" }
  {
      "error": {
          "class": "CommandNotFound",
          "desc": "The command query-tpm has not been found"
      }
  }

Suggested-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>

monitor/hmp-cmds.c

@@ -901,6 +901,7 @@ void hmp_info_pci(Monitor *mon, const QDict *qdict)
 
 void hmp_info_tpm(Monitor *mon, const QDict *qdict)
 {
+#ifdef CONFIG_TPM
     TPMInfoList *info_list, *info;
     Error *err = NULL;
     unsigned int c = 0;
@@ -946,6 +947,9 @@ void hmp_info_tpm(Monitor *mon, const QDict *qdict)
         c++;
     }
     qapi_free_TPMInfoList(info_list);
+#else
+    monitor_printf(mon, "TPM device not supported\n");
+#endif /* CONFIG_TPM */
 }
 
 void hmp_quit(Monitor *mon, const QDict *qdict)