Revert "KVM: x86/tdp_mmu: Add a helper function to walk down the TDP MMU"

Remove the helper and exports that were added to allow TDX code to reuse
kvm_tdp_map_page() for its gmem post-populate flow now that a dedicated
TDP MMU API is provided to install a mapping given a gfn+pfn pair.

This reverts commit 2608f105760115e94a03efd9f12f8fbfd1f9af4b.

Reviewed-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
Reviewed-by: Binbin Wu <binbin.wu@linux.intel.com>
Reviewed-by: Kai Huang <kai.huang@intel.com>
Reviewed-by: Yan Zhao <yan.y.zhao@intel.com>
Tested-by: Yan Zhao <yan.y.zhao@intel.com>
Tested-by: Kai Huang <kai.huang@intel.com>
Link: https://patch.msgid.link/20251030200951.3402865-7-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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