Intel: 9th and 9.5th gen GPUs need to manually have GuC loading enabled, newer GPUs should stay at `-1` for automatic management

[ahydronous]

See here: https://wiki.gentoo.org/wiki/Intel#GuC/HuC_firmware

i915.enable_guc=3

Note that the iGPU generations don't map neatly to the corresponding CPU generations. Some newer CPU generations use older iGPUs and vice versa.