MAINTAINERS: Reorganize KVM/x86 maintainership

For the last few years I have been the sole maintainer of KVM, albeit
getting serious help from all the people who have reviewed hundreds of
patches.  The volume of KVM x86 alone has gotten to the point where one
maintainer is not enough; especially if that maintainer is not doing it
full time and if they want to keep up with the evolution of ARM64 and
RISC-V at both the architecture and the hypervisor level.

So, this patch is the first step in restoring double maintainership
or even transitioning to the submaintainer model of other architectures.

The changes here were mostly proposed by Sean offlist and they are twofold:

- revisiting the set of KVM x86 reviewers.  It's important to have an
  an accurate list of people that are actively reviewing patches ("R"),
  as well as people that are able to act on bug reports ("M").  Otherwise,
  voids to be filled are not easily visible.  The proposal is to split
  KVM on Hyper-V, which is where Vitaly has been the main contributor
  for quite some time now; likewise for KVM paravirt support, which
  has been the main interest of Wanpeng and to which Vitaly has also
  contributed (e.g., for async page faults).  Jim and Joerg have not been
  particularly active (though Joerg has worked on guest support for AMD
  SEV); knowing them a bit, I can't imagine they would object to their
  removal or even be surprised, but please speak up if you do.

- promoting Sean to maintainer for KVM x86 host support.  While for
  now this changes little, let's treat it as a harbinger for future
  changes.  The plan is that I would keep the final integration testing
  for quite some time, and probably focus more on -rc work.  This will
  give me more time to clean up my ad hoc setup and moving towards a
  more public CI, with Sean focusing instead on next-release patches,
  and the testing up to where kvm-unit-tests and selftests pass.  In
  order to facilitate collaboration between Sean and myself, we'll
  also formalize a bit more the various branches of kvm.git.

Nothing is going to change with respect to handling pull requests to Linus
and from other architectures, as well as maintainance of the generic code
(which I expect and hope to be more important as architectures try to
share more code) and documentation.  However, it's not a coincidence
that my entry is now the last for x86, ready to be demoted to reviewer
if/when the right time comes.

Suggested-by: Sean Christopherson <seanjc@google.com>
Co-developed-by: Sean Christopherson <seanjc@google.com>
Cc: kvm@vger.kernel.org
Cc: Sean Christopherson <seanjc@google.com>
Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: Wanpeng Li <wanpengli@tencent.com>
Cc: Jim Mattson <jmattson@google.com>
Cc: Joerg Roedel <joro@8bytes.org>
Acked-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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