Move suspension q's cleanup to proc/suspension_q.c

kernel/proc/suspension_q.h

@@ -4,9 +4,13 @@
 #include <libk/list.h>
 #include <sync/spin_lock.h>
 
+struct proc;
+
 struct proc_suspension_q {
   struct list_node_link* proc_list;
   spin_lock_t lock;
 };
 
+void proc_sqs_cleanup (struct proc* proc);
+
 #endif // _KERNEL_PROC_SUSPENTION_Q_H