vdpa: Remove unused declarations

vdpa: Remove unused declarations

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Signed-off-by: Yue Haibing <yuehaibing@huawei.com>
Message-Id: <20240819140930.122019-1-yuehaibing@huawei.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Shannon Nelson <shannon.nelson@amd.com>
Reviewed-by: Zhu Lingshan <lingshan.zhu@kernel.org>
Reviewed-by: Shannon Nelson &lt;<a href="mailto:shannon.nelson@amd.com" target="_blank">shannon.nelson@amd.com</a>&gt;<br>
Reviewed-by: Zhu Lingshan <lingshan.zhu@kernel.org>