btrfs: merge async_cow_start and compress_file_range

There is no good reason to have the simple async_cow_start wrapper,
merge the argument conversion into the main compress_file_range function.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>