ida: remove abandoned macros

3 IDA_ started macros aren't used from commit f32f004c ("ida: Convert
to XArray"). so better to remove them.
Signed-off-by: Alex Shi <alex.shi@linux.alibaba.com>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>

lib/radix-tree.c

@@ -55,14 +55,6 @@ struct kmem_cache *radix_tree_node_cachep;
 						RADIX_TREE_MAP_SHIFT))
 #define IDR_PRELOAD_SIZE	(IDR_MAX_PATH * 2 - 1)
 
-/*
- * The IDA is even shorter since it uses a bitmap at the last level.
- */
-#define IDA_INDEX_BITS		(8 * sizeof(int) - 1 - ilog2(IDA_BITMAP_BITS))
-#define IDA_MAX_PATH		(DIV_ROUND_UP(IDA_INDEX_BITS, \
-						RADIX_TREE_MAP_SHIFT))
-#define IDA_PRELOAD_SIZE	(IDA_MAX_PATH * 2 - 1)
-
 /*
  * Per-cpu pool of preloaded nodes
  */