btrfs: remove btrfs_crc32c wrapper

This simply sends the same arguments into crc32c(), and is just used in
a few places.  Remove this wrapper and directly call crc32c() in these
instances.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>