tools/power/x86/intel-speed-select: Use cgroup v2 isolation

tools/power/x86/intel-speed-select: Use cgroup v2 isolation

On supported systems, it is possiible to isolate CPUs instead of
CPU online/offline. This is optional and can be specified using
-g option when running as daemon or in combination with -o option
for SST-PP level change.

CPU isolation doesn't isolate IRQs. So IRQs needs to be moved away
from isoolated CPUs. This can be done via IRQ sysfs or irqbalance daemon.

The IRQ balance daemon is also capable to parse thermal HFI messages to
move IRQs away from CPUS, which are supposed be isolated. But this
requires version released after July 2022.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>