hwrng: cn10k - Add random number generator support

CN10K series of silicons support true random number
generators. This patch adds support for the same. Also
supports entropy health status checking.

Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: Bharat Bhushan <bbhushan2@marvell.com>
Signed-off-by: Joseph Longever <jlongever@marvell.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>