KVM: x86/mmu: Rename .private_max_mapping_level() to .gmem_max_mapping_level()

KVM: x86/mmu: Rename .private_max_mapping_level() to .gmem_max_mapping_level()

Rename kvm_x86_ops.private_max_mapping_level() to .gmem_max_mapping_level()
in anticipation of extending guest_memfd support to non-private memory.

No functional change intended.

Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Acked-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Ackerley Tng <ackerleytng@google.com>
Signed-off-by: Fuad Tabba <tabba@google.com>
Co-developed-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Fuad Tabba <tabba@google.com>
Message-ID: <20250729225455.670324-13-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>