tpm: remove unnecessary #ifdef CONFIG_TPM

Makefile.objs now checks for $(CONFIG_TPM).
Suggested-by: NStefan Berger <stefanb@linux.vnet.ibm.com>
Signed-off-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: NStefan Berger <stefanb@linux.vnet.ibm.com>
Reviewed-by: NJuan Quintela <quintela@redhat.com>
Signed-off-by: NStefan Berger <stefanb@linux.vnet.ibm.com>

tpm.c

@@ -30,8 +30,6 @@ void tpm_register_model(enum TpmModel model)
     tpm_models[model] = true;
 }
 
-#ifdef CONFIG_TPM
-
 static const TPMBackendClass *
 tpm_be_find_by_type(enum TpmType type)
 {
@@ -192,8 +190,6 @@ int tpm_config_parse(QemuOptsList *opts_list, const char *optarg)
     return 0;
 }
 
-#endif /* CONFIG_TPM */
-
 /*
  * Walk the list of active TPM backends and collect information about them
  * following the schema description in qapi-schema.json.