random: If we have arch_get_random_seed*(), try it before blocking

If we have arch_get_random_seed*(), try to use it for emergency refill
of the entropy pool before giving up and blocking on /dev/random.  It
may or may not work in the moment, but if it does work, it will give
the user better service than blocking will.

Reviewed-by: Ingo Molnar <[email protected]>
Signed-off-by: H. Peter Anvin <[email protected]>
Signed-off-by: Theodore Ts'o <[email protected]>

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