UPSTREAM: cmd: add rng command

For the RNG uclass we currently only have a test working on the sandbox.

Provide a command to test the hardware random number generator on
non-sandbox systems.

Signe

UPSTREAM: cmd: add rng command

For the RNG uclass we currently only have a test working on the sandbox.

Provide a command to test the hardware random number generator on
non-sandbox systems.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
(cherry picked from commit 4f24ac08afccd5f51f0b4c7023fc8cf45efe8163)

Change-Id: Icb2a9359417a8168a38e1fc009960e8c6df924e4
Signed-off-by: Lin Jinhan <troy.lin@rock-chips.com>

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