f2fs: set default compress option only when sb_has_compression

If the compress feature is not enabled, there is no need to set
compress-related parameters.

Signed-off-by: Yangtao Li <frank.li@vivo.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>