KVM: Rename kvm_slot_can_be_private() to kvm_slot_has_gmem()

Rename kvm_slot_can_be_private() to kvm_slot_has_gmem() to improve
clarity and accurately reflect its purpose.

The function kvm_slot_can_be_private() was previously used to check if a
given kvm_memory_slot is backed by guest_memfd. However, its name
implied that the memory in such a slot was exclusively "private".

As guest_memfd support expands to include non-private memory (e.g.,
shared host mappings), it's important to remove this association. The
new name, kvm_slot_has_gmem(), states that the slot is backed by
guest_memfd without making assumptions about the memory's privacy
attributes.

Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: Shivank Garg <shivankg@amd.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Co-developed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Fuad Tabba <tabba@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-ID: <20250729225455.670324-7-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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