This adds the Hisilicon Random Number Generator(RNG) support,
which is found in Hip04 and Hip05 soc.
Reviewed-by: NMathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: NKefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>