btrfs: drop redundant forward declaration in props.c

Drop forward declaration of the functions:

- prop_compression_validate
- prop_compression_apply
- prop_compression_extract

No functional changes.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>