feat(marvell): add trng driver

Armada-7K/8K and CN913x integrated the Rambus EIP-97 IP on CP11x die. It
supports to generate up to 4 32-bit random number in one shot.

This trivial driver provisions a simple API to read the random numbers
from hardware. It allows the bootloader to get one 32-bit or 64-bit
random number via SMC call to support KASLR.

Change-Id: I1707a85512ca163b8c7ab1644ff0f7e2fcf57344
Signed-off-by: Wilson Ding <dingwei@marvell.com>
4 files changed