UPSTREAM: vsock/virtio: support to send non-linear skb

For non-linear skb use its pages from fragment array as buffers in
virtio tx queue. These pages are already pinned by 'get_user_pages()'
during such skb creation.

Signed-off-by: Arseniy Krasnov <avkrasnov@salutedevices.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
(cherry picked from commit 64c99d2d)
Bug: 421244320
Signed-off-by: Will Deacon <willdeacon@google.com>
Change-Id: I5aa386a32276c46e3f1d252304a003f1cf65cc9f