list: Remove duplicated and unused macro list_for_each_reverse

Remove macro list_for_each_reverse due to below reasons:

- it is same as list_for_each_prev.
- it is not used by current kernel tree.

Signed-off-by: Zijun Hu <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

include/linux/list.h

···
 	for (pos = (head)->next; !list_is_head(pos, (head)); pos = pos->next)
 
 /**
- * list_for_each_reverse - iterate backwards over a list
- * @pos:	the &struct list_head to use as a loop cursor.
- * @head:	the head for your list.
- */
-#define list_for_each_reverse(pos, head) \
-	for (pos = (head)->prev; pos != (head); pos = pos->prev)
-
-/**
  * list_for_each_rcu - Iterate over a list in an RCU-safe fashion
  * @pos:	the &struct list_head to use as a loop cursor.
  * @head:	the head for your list.