btrfs: move one shot mount option clearing to super.c

There's no reason this has to happen in open_ctree, and in fact in the
old mount API we had to call this from remount.  Move this to super.c,
unexport it, and call it from both mount and reconfigure.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Anand Jain <anand.jain@oracle.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>