Display thermal throttles

[JohnCoates]

nvidia-smi lists Max Clocks and current Clocks. It would be nice to be able to see these, and maybe display these in a % so you know how much you're throttled.

example:

    Clocks
        Graphics                          : 2025 MHz
        SM                                : 2025 MHz
        Memory                            : 10251 MHz
        Video                             : 1785 MHz
    Max Clocks
        Graphics                          : 2100 MHz
        SM                                : 2100 MHz
        Memory                            : 10501 MHz
        Video                             : 1950 MHz