Fix scheduler starvation, use lists for scheduling

kernel/proc/suspension_q.h

@@ -1,11 +1,11 @@
 #ifndef _KERNEL_PROC_SUSPENTION_Q_H
 #define _KERNEL_PROC_SUSPENTION_Q_H
 
-#include <libk/rbtree.h>
+#include <libk/list.h>
 #include <sync/spin_lock.h>
 
 struct proc_suspension_q {
-  struct rb_node_link* proc_tree;
+  struct list_node_link* proc_list;
   spin_lock_t lock;
 };