[FR] Add option to LIMIT Maximum CPU frequency

Given that CPU power draw is roughly proportional/growing to SQUARE of its frequency, limiting maximum CPU frequency is a great way to significantly reduce power draw while loosing just a little bit of performance per core.

Given poor cooling system in modern lightweight thin/ultrabooks this will also allow one to use more cores (while preserving same or lower CPU temperature), which in real life results in higher total performance.

Example use cases that will benefit from limiting maximum CPU frequency:

• video compression/conversion
• local run of AI models on CPU
• Games that can use more cores

On my Ryzen laptop Powersave mode does not achieve what's requested here. I know about downvolting, but these are two different and independent ways to reduce power draw. Thank you.