ntfs: submit one bio per compressed write unit

ntfs_write_cb() allocates a single-vector bio and synchronously submits it
whenever another output page cannot be added. A 64 KiB uncompressed unit
therefore requires up to sixteen separate bio submissions.

Allocate enough vectors for the complete unit, add all output pages, and
perform one synchronous submission.

Reviewed-by: Hyunchul Lee <hyc.lee@gmail.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>

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