ksmbd: tighten create file attribute validation

smb2.create.gentest checks each create FileAttributes bit independently and
expects FILE_ATTRIBUTE_INTEGRITY_STREAM and FILE_ATTRIBUTE_NO_SCRUB_DATA to
be rejected with STATUS_INVALID_PARAMETER.

ksmbd validates create FileAttributes against FILE_ATTRIBUTE_MASK, which
includes those bits. It also rejects only requests that have no known
attribute bit at all, so a request containing both known and unknown bits
can pass validation.

Use a create-specific attribute mask that excludes INTEGRITY_STREAM and
NO_SCRUB_DATA, and reject any bit outside that mask.

Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>

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