target/openrisc: Explicitly set 2-NaN propagation rule

target/openrisc: Explicitly set 2-NaN propagation rule

Set the NaN propagation rule explicitly for the float_status word
used in the openrisc target.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20241025141254.2141506-20-peter.maydell@linaro.org