hypervisor callbacks in w8

There are couple of exported functions to set up some hypervisor related callbacks

HvlRegisterWheaErrorNotification
Set WHEA callback into global variable HvlpWheaErrorNotificationCallback

HvlRegisterInterruptCallback
Set up to 5 (in w8 release preview up to 8) callbacks in global array HvlpInterruptCallback. This callbacks are called in HvlRouteInterrupt:

• index 0 - from KiHvInterrupt
• index 1 - from KiVmbusInterrupt0
• index 2 - from KiVmbusInterrupt1
• index 3 - from KiVmbusInterrupt2
• index 4 - from KiVmbusInterrupt3