tests/qemu-iotests/testenv: Use the "virt" machine for or1k

When compiling QEMU just with "--target-list=or1k-softmmu", there
are 8 iotests failing that try to use PCI devices - but the default
or1k machine does not have a PCI bus. The "virt" machine is better
suited for running the iotests than the or1k default machine since
it provides PCI and thus e.g. support for virtio-blk and virtio-scsi,
too. With this change, there are no failing iotests anymore when
using the qemu-system-or1k binary for running the tests.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Michael Tokarev <mjt@tls.msk.ru>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

tests/qemu-iotests/testenv.py

diff --git a/tests/qemu-iotests/testenv.py b/tests/qemu-iotests/testenv.py
index c8848f2..0b32eec 100644
--- a/tests/qemu-iotests/testenv.py
+++ b/tests/qemu-iotests/testenv.py
@@ -240,6 +240,7 @@ def __init__(self, source_dir: str, build_dir: str,
             ('aarch64', 'virt'),
             ('avr', 'mega2560'),
             ('m68k', 'virt'),
+            ('or1k', 'virt'),
             ('riscv32', 'virt'),
             ('riscv64', 'virt'),
             ('rx', 'gdbsim-r5f562n8'),