[Bug 230870] Deprecate Yarrow

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230870

            Bug ID: 230870
           Summary: Deprecate Yarrow
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: cem at freebsd.org

I think we should deprecate Yarrow as soon as we possibly can.  I think it
would be reasonable to gone_in(12) it, even, removing it from tree before
stable/12.

At the very least, it should be gone_in(13)'d and removed after stable/12
branches.

We discussed this briefly on orthogonal devrandom bugs, and one concern raised
was embedded systems may prefer the lower space usage of Yarrow.

In response to that, I quantified the difference in state size and came up with
962 bytes.  Do we have embedded systems today that would trade a weak devrandom
for 962 bytes of memory?

I suspect not.  IIRC, the smallest system we can run on today is either 32 or
64 MB, and even that requires quite a bit of manual tweaking to get a minimal
kernel and almost no userspace.  And on such a 32MB system, 962 bytes is
0.003%.  Is that small enough to be de minimis?  I think so.  If you can't run
with 33553470 bytes of memory it is unlikely you will be able to run with
33554432.

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