btrfs: move btrfs_compression_type to compression.h

So that its better organized.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
index d2e2992..19b7bf4 100644
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -34,6 +34,7 @@
 #include "disk-io.h"
 #include "btrfs_inode.h"
 #include "transaction.h"
+#include "compression.h"
 
 static int g_verbose = 0;