Add support for pcm-latency command when hyper threading is off

Hello, I need to run a program and measure the information collected by `pcm-latency`.

But I need to run the program on a server with hyper-threading off. `pcm-latency` doesn't support that at the moment: https://github.com/intel/pcm/blob/master/src/pcm-latency.cpp#L385-L389

Can you please add support for that, if it's easy to do so? If not, what are the reasons that led to the choice of not supporting that?