ufs: use dcache helpers for scsi_cmd data and only invalidate if necessary

Now we have proper flush and invalidate helpers, we can use them
directly to operate on the scsi_cmd data.

Likewise, we do not need to flush then invalidate, just flush _or_
invalidate depending on the data direction.

Reviewed-by: Neha Malcom Francis <[email protected]>
Tested-by: Venkatesh Yadav Abbarapu <[email protected]>
Tested-by: Julius Lehmann <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Neil Armstrong <[email protected]>

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