crypto/nitrox: move common code

A new compressdev Nitrox PMD will be added in next few patches.
This patch moves some of the common code which is shared across
Nitrox crypto and compress drivers to

crypto/nitrox: move common code

A new compressdev Nitrox PMD will be added in next few patches.
This patch moves some of the common code which is shared across
Nitrox crypto and compress drivers to drivers/common/nitrox folder.

Signed-off-by: Nagadheeraj Rottela <rnagadheeraj@marvell.com>
Acked-by: Akhil Goyal <gakhil@marvell.com>

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