hpfs: convert hpfs to use the new mount api

Convert the hpfs filesystem to use the new mount API.
Tested by comparing random mount & remount options before and after
the change.

Signed-off-by: Eric Sandeen <[email protected]>
Signed-off-by: Mikulas Patocka <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Christian Brauner <[email protected]>

Author: Eric Sandeen