kmc-solid: Wait queue should be sorted in the descending order of task priorities

In ITRON, lower priority values mean higher priorities.

library/std/src/sys/itron/condvar.rs

@@ -192,7 +192,7 @@ pub unsafe fn insert(&mut self, mut waiter_ptr: NonNull<Waiter>) {
                     let insert_after = {
                         let mut cursor = head.last;
                         loop {
-                            if waiter.priority <= cursor.as_ref().priority {
+                            if waiter.priority >= cursor.as_ref().priority {
                                 // `cursor` and all previous waiters have the same or higher
                                 // priority than `current_task_priority`. Insert the new
                                 // waiter right after `cursor`.