nvdimm: virtio_pmem: drop owner assignment

virtio core already sets the .owner, so driver does not need to.

Acked-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Message-Id: <20240331-module-owner-virtio-v2-21-98f04bfaf46a@linaro.org>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
Reviewed-by: Pankaj Gupta <pankaj.gupta@amd.com>