KVM: TDX: Move lockdep assert in __tdp_mmu_set_spte_atomic() to TDX code

Move the MMU lockdep assert in __tdp_mmu_set_spte_atomic() into the TDX
specific op because the assert is TDX specific in intention.

The TDP MMU has many lockdep asserts for various scenarios, and in fact
the callchains that are used for TDX already have a lockdep assert which
covers the case in __tdp_mmu_set_spte_atomic(). However, these asserts are
for management of the TDP root owned by KVM. In the
__tdp_mmu_set_spte_atomic() assert case, it is helping with a scheme to
avoid contention in the TDX module during zap operations. That is very
TDX specific.

One option would be to just remove the assert in
__tdp_mmu_set_spte_atomic() and rely on the other ones in the TDP MMU. But
that assert is for a different intention, and too far away from the
SEAMCALL that needs it. So just move it to TDX code.

Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
Signed-off-by: Yan Zhao <yan.y.zhao@intel.com>
Link: https://patch.msgid.link/20260509075557.4226-1-yan.y.zhao@intel.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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