hwrng: bcm2835 - Manage an optional clock

One of the last steps before bcm63xx-rng can be eliminated is to manage
a clock during hwrng::init and hwrng::cleanup, so fetch it in the probe
function, and manage it during these two steps when valid.

Signed-off-by: Florian Fainelli <[email protected]>
Reviewed-by: Eric Anholt <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>

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