f2fs: Configure dentry operations at dentry-creation time

This was already the case for case-insensitive before commit
bb9cd910 ("fscrypt: Have filesystems handle their d_ops"), but it
was changed to set at lookup-time to facilitate the integration with
fscrypt.  But it's a problem because dentries that don't get created
through ->lookup() won't have any visibility of the operations.

Since fscrypt now also supports configuring dentry operations at
creation-time, do it for any encrypted and/or casefold volume,
simplifying the implementation across these features.

Reviewed-by: Eric Biggers <ebiggers@google.com>
Link: https://lore.kernel.org/r/20240221171412.10710-9-krisman@suse.de


Signed-off-by: Gabriel Krisman Bertazi <krisman@suse.de>