KVM: x86/mmu: Add a helper function to check if an SPTE needs atomic write

Move conditions in kvm_tdp_mmu_write_spte() to check if an SPTE should
be written atomically or not to a separate function.

This new function, kvm_tdp_mmu_spte_need_atomic_write(),  will be used
in future commits to optimize clearing bits in SPTEs.

Signed-off-by: Vipin Sharma <[email protected]>
Reviewed-by: David Matlack <[email protected]>
Reviewed-by: Ben Gardon <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Sean Christopherson <[email protected]>

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