xen/common: Guard freeze/thaw_domains functions with CONFIG_SYSTEM_SUSPEND

This patch adds CONFIG_SYSTEM_SUSPEND guards around freeze_domains
and thaw_domains functions.

This ensures they are only compiled into the hypervisor when the system
suspend functionality is enabled, aligning their inclusion with their
specific use case.

This addresses two Misra Rule 2.1 violations.

Signed-off-by: Mykola Kvach <mykola_kvach@epam.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>

xen/common/domain.c

@@ -2411,6 +2411,8 @@ domid_t get_initial_domain_id(void)
     return 0;
 }
 
+#ifdef CONFIG_SYSTEM_SUSPEND
+
 void freeze_domains(void)
 {
     struct domain *d;
@@ -2436,6 +2438,8 @@ void thaw_domains(void)
     rcu_read_unlock(&domlist_read_lock);
 }
 
+#endif /* CONFIG_SYSTEM_SUSPEND */
+
 /*
  * Local variables:
  * mode: C