btrfs: drop the commit_cycles stuff for data reservations

This was an old wart left over from how we previously did data
reservations.  Before we could have people race in and take a
reservation while we were flushing space, so we needed to make sure we
looped a few times before giving up.  Now that we're using the ticketing
infrastructure we don't have to worry about this and can drop the logic
altogether.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Tested-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>