igvm: Add support for reading and writing 2MB pages

[jethrogb]

Fixes the “TODO: Support 2MB page data” work items in the code.

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[jethrogb]

I got feedback from our legal on the CLA: you're asking us to grant patent rights to you, but the license on this project (MIT) doesn't grant patent rights to users. That seems a little tricky?

[chris-oo]

Do you need more specifics on the Microsoft CLA? Does https://opensource.microsoft.com/cla/ answer your questions, or do you need more information? I can find the right internal OSS contacts if so, but I don't know the answer to your question otherwise.

[jethrogb]

Well, the main question is, why aren't you granting patent rights to users of this project? For example by using an Apache 2.0 license.