Revert "random: block in /dev/urandom"

This reverts commit 6f98a4bfee72c22f50aedb39fb761567969865fe.

It turns out we still can't do this.  Way too many platforms that don't
have any real source of randomness at boot and no jitter entropy because
they don't even have a cycle counter.

As reported by Guenter Roeck:

 "This causes a large number of qemu boot test failures for various
  architectures (arm, m68k, microblaze, sparc32, xtensa are the ones I
  observed).

  Common denominator is that boot hangs at 'Saving random seed:'"

This isn't hugely unexpected - we tried it, it failed, so now we'll
revert it.

Link: https://lore.kernel.org/all/[email protected]/
Reported-and-bisected-by: Guenter Roeck <[email protected]>
Cc: Jason Donenfeld <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

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