Kill off include/kvm (through file moves/renames), and standardize the set of
KVM includes across all architectures.
This conflicts with Colton's partioned PMU series[1], but this should work as
a nice prepatory cleanup for the partitioned PMU work (and hopefully can land
sooner).
Note, these patches were originally posted as part of a much larger and more
agressive RFC[1]. We've effectively abandoned upstreaming the multi-KVM idea,
but I'm trying to (slowly) upstream the bits and pieces that I think/hope are
generally beneficial.
[1] https://lore.kernel.org/all/20250602192702.2125115-1-coltonlewis@xxxxxxxxxx
[2] https://lore.kernel.org/all/20230916003118.2540661-1-seanjc@xxxxxxxxxx