btrfs: move btrfs_caching_type to block-group.h

This is a block group related definition, move it into block-group.h.
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/block-group.h

@@ -57,6 +57,13 @@ enum btrfs_block_group_flags {
 	BLOCK_GROUP_FLAG_ZONED_DATA_RELOC,
 };
 
+enum btrfs_caching_type {
+	BTRFS_CACHE_NO,
+	BTRFS_CACHE_STARTED,
+	BTRFS_CACHE_FINISHED,
+	BTRFS_CACHE_ERROR,
+};
+
 struct btrfs_caching_control {
 	struct list_head list;
 	struct mutex mutex;

fs/btrfs/ctree.h

@@ -497,13 +497,6 @@ struct btrfs_free_cluster {
 	struct list_head block_group_list;
 };
 
-enum btrfs_caching_type {
-	BTRFS_CACHE_NO,
-	BTRFS_CACHE_STARTED,
-	BTRFS_CACHE_FINISHED,
-	BTRFS_CACHE_ERROR,
-};
-
 /*
  * Tree to record all locked full stripes of a RAID5/6 block group
  */