linux: build with SCHEDUTIL governor

- it can't be built as a module
- it's not set as the default yet
- for discussion see https://github.com/NixOS/nixpkgs/pull/42330

Changed files
+1
pkgs
os-specific
linux
+1
pkgs/os-specific/linux/kernel/common-config.nix
···
X86_INTEL_PSTATE = yes;
INTEL_IDLE = yes;
CPU_FREQ_DEFAULT_GOV_PERFORMANCE = yes;
+
CPU_FREQ_GOV_SCHEDUTIL = whenAtLeast "4.9" yes;
PM_WAKELOCKS = yes;
};