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 <n-francis@ti.com>
Tested-by: Venkatesh Yadav Abbarapu <venkatesh.abbarapu@amd.com>
Tested-by: Julius Lehmann <lehmanju@devpi.de>
Link: https://lore.kernel.org/r/20240930-topic-ufs-enhancements-v3-4-58234f84ab89@linaro.org
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>

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