maintainers: claim responsibility for virtio PMD
maintainers: claim responsibility for virtio PMD

Add myself as co-maintainer for virtio driver.

Signed-off-by: Tiwei Bie <f338cf29d7d69ff1bc99f755ebfb0eb0accd409e@intel.com>
Acked-by: Yuanhan Liu <5219796f50b7b6a5f4ac3e8f0a0f9501ee64a87c@fridaylinux.org>
Acked-by: Maxime Coquelin <9a2667dee3b90866bbc9c2696cff2b7d5616c95a@redhat.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk