random: always wake up entropy writers after extraction

Now that POOL_BITS == POOL_MIN_BITS, we must unconditionally wake up
entropy writers after every extraction. Therefore there's no point of
write_wakeup_threshold, so we can move it to the dustbin of unused
compatibility sysctls. While we're at it, we can fix a small comparison
where we were waking up after <= min rather than < min.

Cc: Theodore Ts'o <[email protected]>
Suggested-by: Eric Biggers <[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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