kunit: tool: Enable virtio/PCI by default on UML

kunit: tool: Enable virtio/PCI by default on UML

There are several tests which depend on PCI, and hence need a bunch of
extra options to run under UML. This makes it awkward to give
configuration instructions (whether in documentation, or as part of a
.kunitconfig file), as two separate, incompatible sets of config options
are required for UML and "most other architectures".

For non-UML architectures, it's possible to add default kconfig options
via the qemu_config python files, but there's no equivalent for UML. Add
a new tools/testing/kunit/configs/arch_uml.config file containing extra
kconfig options to use on UML.

Tested-by: José Expósito <[email protected]>
Reviewed-by: Daniel Latypov <[email protected]>
Signed-off-by: David Gow <[email protected]>
Reviewed-by: Brendan Higgins <[email protected]>
Signed-off-by: Daniel Latypov <[email protected]>
Signed-off-by: Shuah Khan <[email protected]>