bcache: remove unused constants

Remove constants MAX_NEED_GC and MAX_SAVE_PRIO in btree.c that have been unused
since initial commit.

Signed-off-by: Robert Pang <[email protected]>
Signed-off-by: Coly Li <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>

Author: robert-pang

drivers/md/bcache/btree.c

@@ -88,8 +88,6 @@
  * Test module load/unload
  */
 
-#define MAX_NEED_GC		64
-#define MAX_SAVE_PRIO		72
 #define MAX_GC_TIMES		100
 #define MIN_GC_NODES		100
 #define GC_SLEEP_MS		100