btrfs: don't print 'flagging with big metadata' anymore on mount

Added in commit 727011e0 ("Btrfs: allow metadata blocks larger than
the page size") in 2010 and it's been default for mkfs since 3.12
(2013).  The message doesn't really convey any useful information to
users. Remove it.
Reviewed-by: NQu Wenruo <wqu@suse.com>
Signed-off-by: NNikolay Borisov <nborisov@suse.com>
Reviewed-by: NDavid Sterba <dsterba@suse.com>
Signed-off-by: NDavid Sterba <dsterba@suse.com>

fs/btrfs/disk-io.c

@@ -3528,12 +3528,8 @@ int __cold open_ctree(struct super_block *sb, struct btrfs_fs_devices *fs_device
 	 * Flag our filesystem as having big metadata blocks if they are bigger
 	 * than the page size.
 	 */
-	if (btrfs_super_nodesize(disk_super) > PAGE_SIZE) {
-		if (!(features & BTRFS_FEATURE_INCOMPAT_BIG_METADATA))
-			btrfs_info(fs_info,
-				"flagging fs with big metadata feature");
+	if (btrfs_super_nodesize(disk_super) > PAGE_SIZE)
 		features |= BTRFS_FEATURE_INCOMPAT_BIG_METADATA;
-	}
 
 	/*
 	 * mixed block groups end up with duplicate but slightly offset