hwrng: core - start hwrng kthread also for untrusted sources

Start the hwrng kthread even if the hwrng source has a quality setting
of zero. Then, every crng reseed interval, one batch of data from this
zero-quality hwrng source will be mixed into the CRNG pool.

This patch is based on the assumption that data from a hwrng source
will not actively harm the CRNG state. Instead, many hwrng sources
(such as TPM devices), even though they are assigend a quality level of
zero, actually provide some entropy, which is good enough to mix into
the CRNG pool every once in a while.

Cc: Herbert Xu <[email protected]>
Cc: Jason A. Donenfeld <[email protected]>
Signed-off-by: Dominik Brodowski <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>

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