KVM: x86/mmu: Consolidate Dirty vs. Writable clearing logic in TDP MMU

Deduplicate the guts of the TDP MMU's clearing of dirty status by
snapshotting whether to check+clear the Dirty bit vs. the Writable bit,
which is the only difference between the two flavors of dirty tracking.

Note, kvm_ad_enabled() is just a wrapper for shadow_accessed_mask, i.e.
is constant after kvm-{intel,amd}.ko is loaded.

Link: https://lore.kernel.org/all/[email protected]
Signed-off-by: Vipin Sharma <[email protected]>
[sean: split to separate patch, apply to dirty log, write changelog]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Sean Christopherson <[email protected]>

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