maple_tree: remove the redundant code

The macros CONFIG_DEBUG_MAPLE_TREE_VERBOSE no one uses, functions
mas_dup_tree() and mas_dup_store() are not implemented, just function
declaration, so drop it.

Link: https://lkml.kernel.org/r/20221221060058.609003-6-vernon2gm@gmail.com
Signed-off-by: Vernon Yang <vernon2gm@gmail.com>
Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

include/linux/maple_tree.h

@@ -12,7 +12,6 @@
 #include <linux/rcupdate.h>
 #include <linux/spinlock.h>
 /* #define CONFIG_MAPLE_RCU_DISABLED */
-/* #define CONFIG_DEBUG_MAPLE_TREE_VERBOSE */
 
 /*
  * Allocated nodes are mutable until they have been inserted into the tree,
@@ -483,9 +482,6 @@ static inline bool mas_is_paused(struct ma_state *mas)
 	return mas->node == MAS_PAUSE;
 }
 
-void mas_dup_tree(struct ma_state *oldmas, struct ma_state *mas);
-void mas_dup_store(struct ma_state *mas, void *entry);
-
 /*
  * This finds an empty area from the highest address to the lowest.
  * AKA "Topdown" version,