hw/virtio/virtio-qmp: make compilation unit common

All compile time conditionals have no impact at runtime, since they are
representing only possible features for devices present at runtime.

In case they are not present, associated features table will never be
used. In case they are present but some features are not, matching bits
will never be enabled, so those entries will be unused.

Thus, simply expose everything and call it a day.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Tested-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Link: https://lore.kernel.org/qemu-devel/20260225041948.52929-6-philmd@linaro.org
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>