KVM: x86/tdp_mmu: Introduce KVM MMU root types to specify page table type

Define an enum kvm_tdp_mmu_root_types to specify the KVM MMU root type [1]
so that the iterator on the root page table can consistently filter the
root page table type instead of only_valid.

TDX KVM will operate on KVM page tables with specified types.  Shared page
table, private page table, or both.  Introduce an enum instead of bool
only_valid so that we can easily enhance page table types applicable to
shared, private, or both in addition to valid or not.  Replace
only_valid=false with KVM_ANY_ROOTS and only_valid=true with
KVM_ANY_VALID_ROOTS.  Use KVM_ANY_ROOTS and KVM_ANY_VALID_ROOTS to wrap
KVM_VALID_ROOTS to avoid further code churn when direct vs mirror root
concepts are introduced in future patches.

Link: https://lore.kernel.org/kvm/ZivazWQw1oCU8VBC@google.com/ [1]
Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
Signed-off-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
Message-ID: <20240718211230.1492011-11-rick.p.edgecombe@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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