btrfs: remove the root argument from log_new_dir_dentries()

There's no point in passing a root argument to log_new_dir_dentries()
because it always corresponds to the root of the given inode. So remove
it and extract the root from the given inode.

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>