Missing flake reference for lenovo-legion-16irx9h

[sum-rock]

There is a configuration for the lenovo-legion-16rix9h but there is no reference to that expression in the flake. The lenovo-legion-16irx8h is referenced but the 9h profile version is missing. I assume this is an accidental omission? I would throw up a PR, as this appears to be a one line fix, but I wanted to check to see if there was context that I was missing.