Setting this helps turn up bugs, and would have caught a recent random.c
bug were it enabled. It doesn't appear to change the performance, either
in build or runtime, of the test suite, so this is an easy choice.

Cc: Phil Elwell <phil@raspberrypi.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

Hacks:
- Requires a number of QEMU patches for second serial port, reboot, and
  stability: https://git.zx2c4.com/qemu-openrisc/log/
- Uses `-smp 1` override, becuase there's no multithreaded TCG support,
  which means the tests don't complete within the 20 minute timeout
  period.

Once these hacks are gone, or1k support can be merged upstream and run
in the CI on every upstream commit.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

This allows the CI to skip the fake seeding step in some cases.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>