Document the bindings used by Northstar Plus(NSP) SoC random number
generator.
Signed-off-by: NYendapally Reddy Dhananjaya Reddy <yendapally.reddy@broadcom.com>
Acked-by: NEric Anholt <eric@anholt.net>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>