ubifs: Configure dentry operations at dentry-creation time

fscrypt now supports configuring dentry operations at dentry-creation
time through the preset sb->s_d_op, instead of at lookup time.
Enable this in ubifs, since the lookup-time mechanism is going away.

Reviewed-by: Eric Biggers <ebiggers@google.com>
Link: https://lore.kernel.org/r/20240221171412.10710-10-krisman@suse.de


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