largefile: replace the `normallookup` call when creating a new lfdirstate
This is the newer, more semantic API.
Differential Revision: https://phab.mercurial-scm.org/D11165
largefile: use `update_file` instead of `normallookup` in `updatelfiles`
This is the newer, more semantic API.
Differential Revision: https://phab.mercurial-scm.org/D11164