hwrng: n2 - add device data descriptions

hwrng: n2 - add device data descriptions

Since we're going to need to keep track of more than just one
attribute of the hardware, we'll change the use of the data field
from the match struct from a single flag to a struct pointer.
This patch adds the struct template and initial descriptions.

Orabug: 25127795

Signed-off-by: Shannon Nelson <shannon.nelson@oracle.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
(cherry picked from commit becbc4940ad8e8ff560e1ceee33d9bb4fe4c9225)
Signed-off-by: Allen Pais <allen.pais@oracle.com>