From: Randy MacLeod <Randy.MacLeod@windriver.com>

This reverts commit d2b445384da3f3e6dab8577b6c56648b5244a788.

Revert this commit since:

 - some systems using oe-core master may still be using kernels from
   before 5.6 pulled in the rng-tools algorithm, and

 - some hardware platforms may not have a hardware random number generator
   and could therefore need to run rngd to avoid long boot-time initialization
   due to a depleted entropy pool.

The additional context that doesn't belong in the commit log
is that we talked about this change in the YP bug review meeting
and decided that we would keep rng-tools in oe-core for 5.0-M2
for the two reasons given above. If we end up adding a test, as described below,
we may never move the recipe to meta-oe.

It seems to me that we need a test that checks if the entropy pool size
ever falls below a critical threshold for "too long" in the first N seconds of boot time.

Getting that test written so that: 
 - qemu VMs and
 - real HW with and without /dev/hwrng 

all pass without the test being too permissive may take some time.

I've created a bug to track adding such a test:
   https://bugzilla.yoctoproject.org/show_bug.cgi?id=15360

Scott,
Do you have any info on the need for rngd on HW without /dev/hwrng but with a kernel >= 5.6 ?

../Randy