md/md-linear: Enable atomic writes

All the infrastructure has already been plumbed to support this for
stacked devices, so just enable the request_queue limits features flag.

A note about chunk sectors for linear arrays:
While it is possible to set a chunk sectors param for building a linear
array, this is for specifying the granularity at which data sectors from
the device are used. It is not the same as a stripe size, like for RAID0.

As such, it is not appropriate to set chunk_sectors request queue limit to
the same value, as chunk_sectors request limit is a boundary for which
requests cannot straddle.

However, request_queue limit max_hw_sectors is set to chunk sectors, which
almost has the same effect as setting chunk_sectors limit.

Link: https://lore.kernel.org/linux-raid/20250903161052.3326176-1-john.g.garry@oracle.com
Signed-off-by: John Garry <john.g.garry@oracle.com>
Reviewed-by: Yu Kuai <yukuai3@fnnas.com>
Signed-off-by: Yu Kuai <yukuai@fnnas.com>

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