This ports the Qcom prng from older hw_random driver.

No change of functionality and move from hw_random to crypto
APIs is done.
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NVinod Koul <vkoul@kernel.org>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>