vsock/virtio: read the negotiated features before using VQs

vsock/virtio: read the negotiated features before using VQs

BugLink: https://bugs.launchpad.net/bugs/1969110
[ Upstream commit c1011c0b3a9c8d2065f425407475cbcc812540b7 ]

Complete the driver configuration, reading the negotiated features,
before using the VQs in the virtio_vsock_probe().

Fixes: 53efbba12cc7 ("virtio/vsock: enable SEQPACKET for transport")
Suggested-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit b64bf5464ad56be06c4d6042be2284116db0ac48)
Signed-off-by: Paolo Pisati <paolo.pisati@canonical.com>