Different IGPU enabled/visibility check

Note: When you get a KP after this change, then change it back and
report it on Github issues. Thanks!
Add Intel Power Gadget style logging

Note: This does not show you the P-States that
AppleIntelCPUPowerManagement.kext/mach_kernel  activates, by writing to
the MSR 0x199, but instead shows you the actual state of the processor!