Hyper-V vPCI: Use current vPCI protocol

[Jork Loeser]

Update the Hyper-V vPCI driver to use the Server-2016 version
of the vPCI protocol, fixing MSI creation and retargeting issues.

[PATCH 1/4] Hyper-V vPCI: Minor format and semantic fix
[PATCH 2/4] Hyper-V vPCI: Use page allocation for hbus structure
[PATCH 3/4] Hyper-V vPCI: Add vPCI version protocol negotiation
[PATCH 4/4] Hyper-V vPCI: use vPCI protocol version 1.2