btrfs: switch to the new mount API

Now that we have all of the parts in place to use the new mount API,
switch our fs_type to use the new callbacks.

There are a few things that have to be done at the same time because of
the order of operations changes that come along with the new mount API.
These must be done in the same patch otherwise things will go wrong.

1. Export and use btrfs_check_options in open_ctree().  This is because
   the options are done ahead of time, and we need to check them once we
   have the feature flags loaded.

2. Update the free space cache settings.  Since we're coming in with the
   options already set we need to make sure we don't undo what the user
   has asked for.

3. Set our sb_flags at init_fs_context time, the fs_context stuff is
   trying to manage the sb_flagss itself, so move that into
   init_fs_context and out of the fill super part.

Additionally I've marked the unused functions with __maybe_unused and
will remove them in a future patch.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Acked-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>