rockchip: rk3308: Enable random generator

The RK3308 SoC contain a crypto engine block that can generate random
numbers.

Add rng node to soc u-boot.dtsi and enable Kconfig options to take
advantage of the random generator.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
2 files changed