stand/edk2: Reorganize the edk2 contrib hierarchy a bit.

* Move sys/contrib/edk2 to stand/contrib/edk2 where it really belongs.

* Put the *Pkg dir as an additional layer. Work that is currently in

stand/edk2: Reorganize the edk2 contrib hierarchy a bit.

* Move sys/contrib/edk2 to stand/contrib/edk2 where it really belongs.

* Put the *Pkg dir as an additional layer. Work that is currently in
progress will require headers from other *Pkg's and we don't want to
jumble them all into one directory.

In-discussion-with: aly

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