tests/avocado: Remove the non-working virtio_check_params test

tests/avocado: Remove the non-working virtio_check_params test

The test has been marked as broken more than 4 years ago [*],
and so far nobody ever cared to fix it. Thus let's simply remove
it now ... if somebody ever needs it again, they can restore the
file from an older version of QEMU.

[*] https://lore.kernel.org/qemu-devel/4bbe9ff8-e1a8-917d-5a57-ce5185da19fa@redhat.com/

Signed-off-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Michael Tokarev <mjt@tls.msk.ru>
(mjt: add reference as suggested by philm)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>