Hyper-V: Detect Extended Destination ID support

[cperciva]

Summary

Hyper-V advertises support for the Extended Destination ID standard via
bit 2 of the value returned in the EAX register when the hypervisor
stack properties are queried via CPUID.

This is based on a a commit to the Linux kernel, as there does not seem
to be any other documentation of this feature.

MFC after: 2 weeks

[cperciva]

Only enable if ext_dest_id is set to -1.

[cperciva]

Move detection code into local_apic.c

[cperciva]

@schakrabarti_microsoft.com I moved the detection code into local_apic.c since I'm using it for both MSIs and APIC RTEs now, but I assume since it's the same code your previous review applies equally well here.