autofs: reformat 0pt enum declaration

The enum of options is only reformated in the patch to convert autofs
to use the mount API so do that now to simplify the conversion patch.

Signed-off-by: Ian Kent <raven@themaw.net>
Reviewed-by: Bill O'Donnell <bodonnel@redhat.com>
Message-Id: <20230922041215.13675-5-raven@themaw.net>
Signed-off-by: Christian Brauner <brauner@kernel.org>