random: pull add_hwgenerator_randomness() declaration into random.h

add_hwgenerator_randomness() is a function implemented and documented
inside of random.c. It is the way that hardware RNGs push data into it.
Therefore, it should be declared in random.h. Otherwise sparse complains
with:

random.c:1137:6: warning: symbol 'add_hwgenerator_randomness' was not declared. Should it be static?

The alternative would be to include hw_random.h into random.c, but that
wouldn't really be good for anything except slowing down compile time.

Cc: Matt Mackall <[email protected]>
Cc: Theodore Ts'o <[email protected]>
Acked-by: Herbert Xu <[email protected]>
Reviewed-by: Eric Biggers <[email protected]>
Reviewed-by: Dominik Brodowski <[email protected]>
Signed-off-by: Jason A. Donenfeld <[email protected]>

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