Unify mshv and whp partition features

Currently when creating a partition we depend a lot on default partition features for both whp and mshv, which can result in different features being exposed in the guest (linux and windows apis are different and enables/disables different things). We should:

1. Make sure we only enable want we need, disable the rest, and probably not rely on default features
2. Make sure mshv and whp do the same thing

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Examples:

LMCE is unconditionally disabled on whp, but is enabled on mshv (if enabled in firmware), unsure if this can expose MCG_EXT_CTL

Start by locating the partition-creation paths for mshv and whp and compare which partition features each path enables, disables, or inherits by default. Use the LMCE behavior as an initial comparison point; done means both paths explicitly expose the same required feature set without relying on differing platform defaults.

Written by the indexing model from the issue text.