VMMSwitcher: test code for disabling the Extended LVT APIC registers on newer AMD boxes

VMMSwitcher: also mask NMI in APIC_REG_LVT_CMCI

kmk incs

VMM: SELM and VMM early HM init changes.

VMM: mask all Local APIC interrupt vectors which are set up to NMI mode during world switch (raw mode only)