Conrad Meyer f19de0a945 random(4): Abstract loader entropy injection
Break random_harvestq_prime up into some logical subroutines.  The goal
is that it becomes easier to add other early entropy sources.

While here, drop pre-12.0 compatibility logic.  loader default configuration
should preload the file as expeced since 12.0.

Approved by:	csprng(delphij, markm)
Differential Revision:	https://reviews.freebsd.org/D22482
2019-11-22 20:20:37 +00:00
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